I don't want to answer yet. I would like to see what they're going to do with the rumored FFIX remake and then it will be easier to understand how it could've been handled differently.
This is a strange idea but, I wonder if for FF7 remake, they had targeted something closer to the PS1 pre-rendered backgrounds and FMV graphics as just the realtime graphics. A level of fidelity that would be more reasonable to produce the entire world of FF7 in one modern game, a look that was more nostalgic while being a step up from the lego people and low-res battle textures, and something that could even run on the Switch, a far more relevant JRPG platform, especially in Japan.
Alas Advent Children alone probably ruined this idea, which the current remake project aspires to outdo.