The Larian CEO has never liked DnD and always wanted to make DoS3. At first they tried to make BG3 as DoS-like as possible and got frustrated when DnD fans pushed back.
I might be missing a point here, but if I don't like DnD, why do I even try to pitch for the IP?
Sure they didn't think they could just make a DOS-BG3 and come away with it. If it was for the popularity and the money, alright, but if so, then they sold themselves and their believes - or at least the CEO did so.
If that's the case, it's pretty heartless to hype so many DnD and BG fans while not sharing that hype at all.
In retrospect, they should have used the characters (or similar characters) and come up with either a new DOS or a new IP.