Man squats.
In fact, the entire Honeybee/Don arc.
The slapstick, violence comedy.
The hyper-exaggerated characters, such as Heidegger with their cartoon laughter and demeanor. I mean, fucking Bugenhagen is an eccentric old man on a flying ball. Put that in a Compilation-style FFVII and try to get it to work.
Fucking Cait Sith, man. That he wasn't on the giant robot in AC is telling, and he didn't exactly work at just the cat part either.
I mean, the writing, the way scenes are set out, the scenarios and much of the mini-game gameplay is all based around a chibi-ish artstyle. SNES spritework translated to 3D. If you want to remake it in the contemporary FFVII artstyle, you'd have to re-work so much of it else it'd fall flat on its face. Just look at the vast tonal difference between anything in the Compilation compared to FFVII itself. And those few elements they did keep tonally the same, such as Rude and Reno, were so ridiculously out of place they'd have threatened to de-rail the entire film were it not already a train-wreck from the word go.
And once you lose that tone, that wistfulness, it's not FFVII anymore. It's something else. I didn't fall in love with hyper-androgynous, "I can't save anyone", navel-gazing characters in a colour-less, super-serious world.