This back and forth about 5e fidelity has been going on for some time; I haven't said a word during any of these conversations and I think that's outrageous.
I bought into BG3's early access specifically because it's based on DnD 5e. Dungeons and Dragons are taking up an increasingly large part of pop culture, with a never ending supply of DnD podcasts, YouTube shows, comedy sketches, livestreams, etc... I've been consuming a metric ton of DnD content, wishing that I may join the fun but never finding a playgroup near me. So when BG3 was announced I figured it was my ticket to 5e and I gladly plonked the cash to play.
The game is definitely fun, but Gale is the best Cleric and sleeping potions create sleeping surfaces and shove and hide distort the action economy and reactions aren't tactical. I feel like I'm missing out on some of the 5e experience, which is a shame because it looks amazing on the Internet.
So I'm with the OP on this: +1 for a full DnD option.