I think that the main reason this game is as good as it is (which is not good) is that they didn't bother to make a new engine from scratch and tried to build on top of the dos engine instead. And it just works poorly for a dnd5 game.
Second reason is that they're inprinting too much of themeselves into the game instead of neutrally realizing the fine system and world that already exist. DnD and Forgotten Realms in particular have character (strong and recognizable), you don't have to bring yours to make it alive/interesting, it's already there. You just mess the things up.
Well I think it works wonders for a DnD game and what you are saying is just a baby duck syndrome. I think the proud DnD 5e protectorate should see the benefits the Larian's approach brings to their beloved DnD game, which is a transitory playground for people who are not aware with the tabletop version. DnD is hard to comprehend for a lot of people, due to social anxieties, elaborate systemic rules, poor imagination and an enormous price tag for player/DM equipment to compensate for the lack of it (imagination). BG3 is more newcomer-friendly, which can easily then result for a new player base for the DnD tabletop, making it even more popular, accessible and easier to set up.
Can not speak for all the crowd, but quite sure a lot of them fear exactly this: people who learn DnD from BG3 and come to the tables with expectations for DnD to be like that - with broken rules and butchered lore.
And yet, I, personally, also think the game is good as it is. The injection of DnD to DoS is refreshing. Beloved features of DoS are still there. Should they position it from the start this way, do not think there would be any complaints. As of now, some little polish, a bit of tweaking - and the game is good to go!
