It's entirely fair to say he has no coherent vision because he had never once shown a consistent vision for what Versus/XV was supposed to be, it changed every single time we saw it under Nomura. And it goes even further to his fanboys acting like they know what Nomura's vision is, when Wan Hazmer who had been part of the XV team ever since Versus back in 2010, stated on his blog back in 2014 that not all of Nomura's "vision" was even shown to the public yet for the game, so how the fuck can his fanboys claim to know what Nomura's vision was for the game when we barely saw anything of it to begin with and it changed each time anyway?
What I just wrote there was not a strawman, you literally said that Nomura is a perfectionist in response to changes in CGI, as if that somehow makes it OK for Nomura to waste money redoing finished CGI. Even more is that you don't seem to understand how CGI is even made or how it differs from regular game assets. For example the 6 minute CGI End of an Era for XIV cost $3 million to make.
https://www.engadget.com/2013/02/21/massively-exclusive-a-dinner-with-final-fantasy-xivs-naoki-yos/
By the way only the 2006 CGI trailer of Noctis fighting the Niflheim soldiers, and the additional CGI shown in the 2008 trailer of Gladio, Ignis, Prompto, Stella, Regis and Ravus for Versus was made by 3~ people, one of the people who worked on those trailers left Square Enix in 2009. Having low amount of people working on it doesn't suddenly mean it wasn't expensive to create, and if you look at the CGI seen in 2011/2013 compared to those earlier trailers you can see an obvious amount of higher polish and effort put into the CG, indicating it did cost a lot more than those old 2006/2008 CG.
And I'm assuming you've played XV and have watched Kingsglaive too, if you have you'd know that none of the CG character assets we saw in the 2011/2013 CG were used in the final game or in Kingsglaive, having the same design for Noctis in CG form and in the game doesn't mean they somehow saved money either because they aren't the same assets used interchangeably, the CGI is not mad by game devs or vice versa, they're made by people in Visual Works Studio, a department separate from game development teams. The only CG asset we can assume they reused from that 2011/2013 CG within Kingsglaive is the room interior where Regis and Iedolas were in and maybe a weapon or two, but that's about it.
Your source for the scenario being set back in 2010 is the same source I was referencing, the scenario is the story, that is the script. In 2015 they said the same exact thing about FF7R having it's scenario complete for part 1, but why would they even need to say that? FF7 already exists so they should already have the scenario complete, oh wait it's because when they are saying scenario is complete they are talking about having a script done. And they would have had to have had a script of somesort done in 2011 because that is when they started voice recording for the game.
As for when Ferrari said that the story for XV was changed from the story the game had in 2011 when it was Versus, he had mentioned it on his Facebook but I just checked through his posts and it seems he deleted quite a few of his posts including the one's where he mentions how Umbra originally had a human form and that Gentiana was a messenger for Stella.
The things you just listed for ReCoM are not even actual story changes, that is a remake showing things that they previously had off screen and showing things rendered in proper 3D instead of limited by sprites like CoM was, if a thing happened off screen but they add a scene showing that offscreen thing happening on screen, that doesn't mean they changed the story, because that thing always happened anyway, and minor dialog updates to make it properly seamless with KH1 to KH2 aren't story changes either, the story of CoM is the same story told in ReCoM, it's only presented in proper 3D instead of as 2D sprites. And Marluxia's hair being bright pink is how his hair was depicted in artwork, whatever pallette they used for his sprite in CoM prevented a full pink like it is in his artwork and 3D model.
And you missed the point I made. Changing an in game model is not the same thing as changing CG. Tidus's design was already finished even when he had black hair, recoloring his hair to blonde didn't change his actual design, only a color choice for his hair. That isn't the same thing as entire ground up character models made in fully CG for Versus never being used ever for the game.
You also seem to be misinterpreting what I'm saying about FF6 and FF7s map structure, I'm not talking about how they are made, I'm talking about how they function within the game itself. Both have SD maps with a giant player character you move around the map, you have points of interest represented on the map while when running through the overworld between those points of interest you become engaged in random battles, the area maps are static fixed maps separate from the overworld and are more in scale with the player character, area maps that you walk on specific path and have collision on buildings and various objects/NPCs. Being in 2D or 3D doesn't change how the maps themselves function within the game for FF7 or FF6. However going from a map like FF7 to a map like FFXV is completely overhauling how the map system is even supposed to work because not only is everything 1:1 scale, but then like with XV it has roaming monsters factors, seamless travel between locations, dungeons etc.
And yes I know it is common, but what is not common is the director of the game saying they have a finished story, 3 years later saying that the story hasn't changed from what it was originally, only for that to be confirmed to be a lie years later by someone who worked on the team confirming that the story had changed between those 3 years. The story changes in XV from Versus aren't even just minor things like additions or reworded dialog that you mentioned for ReCOM, they changed Stella from originally being someone who Noctis met for the first time as an adult in Versus, to in 2013 "Stella" was someone Noctis was seen with as kids, not only does that change the entire foundation of the dynamic from what it was presented as 7 years prior but it's a blatant lie when the director, namely Nomura, says in 2013 that the story hasn't changed since Versus, when anyone who even followed statements and trailers can plainly see it had just from the few few seconds of the 2013 trailer.
In 2010 the Versus team had created a heavily modified version of Crystal Tools that they dubbed Ebony Engine, that Ebony Engine was later integrated into Luminous engine in 2013 when they were migrating to Luminous, Versus was never on the same Crystal Tools build that FF13 used, it was using it's own "game specific engine" that Nomura mentioned it was using in 2011, which we know now to be Ebony Engine. KH2.8s shitty skin shaders is because of a design choice they opted for with 2.8, that is irrelevant to their actual capabilities to make a game, especially since Versus was supposed to be a PS3 game so it wouldn't even have been as graphically demanding as XV is now.
Osaka team originally were going to make BBS as a PS2 game before they moved to PSP, so it's not like they don't know how to make console games, also a large portion of the XV team came from PSP development too coming off Type-0, so using the "but they didn't have experience" doesn't fly here, especially since they were moved to the XV team in 2012 when Nomura was still director, so he had no issues with using handheld staff on the project either. Hell just look at Wan Hazmer again, he joined SE in 2010 and was put straight onto the Versus XIII team, and he had not worked on a single AAA console or handheld game before then, all he had done was some small indie stuff, experience was never a factor for who they wanted on the team.
So this all comes back to Nomura having a team ready but he instead decided to make a KH spinoff instead of finishing Versus for PS3, all while he failed to make anything coherent in the game and it didn't even go past 25% development by the time they rebooted Versus into XV in 2012.