But in BG3, I feel like the 5E action economy ironically has the opposite effect.
Really? This is one of the (many) areas I thought they did really well, and I've only recently gotten back into D&D with some friends from 25+ years ago. My first 5e game session on DnDBeyond / Roll20 was about 2 months ago, and I think a lot of the stuff in this game is pretty accurate. I always hated action points in a game.