Well, they are after all just opinions like you say. Though it is sort of a strong one because how I play my game really shouldn't impact anyone in any way and most definitely shouldn't cause any feelings to be stirred. Also, feelings can be irrational, so as much as we don't have control of how we feel, we have a choice to be aware of them and choose to act differently toward them, especially if the action or language is towards others.
Anyway, I'll speak for myself on my experiences now adays: by focusing mainly on the storyline and not going on the extra 40-60 hours of sidequests most FF offers, I arguably get the most out of a game without any disruptions: I don't have to go online and check on whether I've already missed anything -I still remember 5 hours into FFXII and realized I've opened up a chest that will prevent me from getting the best spear in the game - now that was shitty. I don't think checking guidebooks/forums/chatrooms should be part of my experience with a game, unless it was actually intended to like in Ni no Kuni with the wizard companion.
Don't get me wrong, I still make an effort to do as much as I can during my first playthrough of any games, that is just not my priority. Main story > side missions. For me, the point of playing game, any game, is for entertainment, as long as I achieve that, no points are missed.
Now, to tie in a little bit with IX so we are not off topic too much. I find my experience with other FF games, especially with the two MMO: XI and XIV and XII actually help me define and enjoy the characters of IX even more. Mostly because in MMOs, your role is very defined. When I was younger and played FF games, even though I know the roles of certain characters, I just do what I feel like doing with them, but now, I enjoy having my black mage Vivi doing what he does best even though his MP isn't that high yet, etc. MMOs made me appreciate the job classes even more.