They are doing their own thing - thats the whole point - Larian Studio's vision supported by WOTC - this game is not trying to be a BG3 in the literal sense of game mechanics of the 20 year old titles - its drawing on the world + D&D.
There is nothing wrong with having your level of expectation its just that you may have to temper them for a new vision from Larian. Keep giving feedback & hopefully (myself included) they will pull back towards more D&D aligned rules in some instances - i.e cantrips, surfaces etc.
I for one am throughly loving the game & any modifications made due to feedback by & large should only improve the experience - hopefully for you too.
I'm glad you're enjoying it. I'm finding it to be a deeply unsatisfying slog.
If they're going to use a popular mechanical system, people are going to come in with expectations about how that system works. If they are going to deviate in places, then they really need to:
1) have a good reason for that deviation;
2) implement that deviation in a way that feels fair and satisfying; and
3) clearly communicate that the deviation is happening and explain it so that people who would assume it works a different way can understand what is going on.
It's early, so they still have time to make a lot of changes, but the comments on this forum (and the topic of this thread) indicate that they are failing at a lot of those points so far.
If they aren't going to do a good job at handling points that deviate, I think it would be much better for them to still tell the story of BG3, but drop the mechanical system entirely and use a system that isn't meant to evoke D&D.
