I couldn’t agree more. And as EA testers it’s impossible to judge whether their “improvements” are necessary or not because we don’t get to try it any other way.
You can just play Solasta and have a perfectly working combat system that is (at least for me) about 10 times more fun than BG.
So yeah, for me, all that tweaking and half baked homebrew messing with the rules is completely unneccessary.
D&D 5e was developed with a lot of playtesting and an amazing humility from the game designers who listened to the community.