It's cool the first time they did it, but after that, nah. It's just a waste of time if you ask me.
Think about the alternative timeline in ep Iggy. How much time and resources did they have to devote to that?
New cutscenes, dialogue, animations, voice acting, battle animations and movesets, etc.
At this point in time, 100% focus should be on the official story/timeline. We get more out of that if you think about it.
Of course this is just fun to talk about, and what the developers actually end up doing is outside of our control. I'd prefer it if they didn't though.
They hyped up alternate timelines and realities and, in the main game, they did nothing with that. So if they're going to do that properly as part of the main story, then perhaps.