FF7R's core battle system is phenomenal to me. Tied best with Sekiro for my most enjoyable single-player combat since the PS4 generation started. But it does have a number of flaws and nuisances. For example... I kept switching to the wrong character even after spending 90 hours. Just let me assign each character to a directional button. I know it sounds simple, but I could never consistently switch to the character I wanted during intense/difficult battles lol.
For Rebirth, I'm concerned about enabling perfect parries on all characters, I feel it should remain character-specific. Also not a fan of R1+O parry being a default ability. Parry Materia was kinda broken as is, especially with Tifa's silly slides (made the hardest boss too easy). There seems to be quite a few broken/overpowered/abusable abilities in Remake that need to be reworked in Rebirth.
Essay Pro