I fear that cheap homebrew exploits like Shove, Stealth, Help and metagamed alpha strikes against non-hostile enemies will still rule combat and override D&D rules.

I fear we will get more goofy magic items with nonsensical conditional properties instead of D&D magic items.

I fear Larian can't commit to a proper Long Rest system and we will have the same unlimited resting with a pointless food mini-game attached we have now.