As others have said here, I think they not only underestimated the scale of the project and the IP but they misread the room in terms of attempting to bring what they were known for (ie. DOS) to a new IP, thinking that alone would be enough. Swen said as much in an interview, that their plan was to use the BG IP to reach a larger audience, in essence piggybacking.
I can imagine they had plans to be more communicative but when it became apparent they had no plans to or were unable to implement/remove some of the much requested features/criticisms, they kept quiet rather than deal with the inevitable fallout of categorically ruling out certain things.
In retrospect, they would could have alleviated things somewhat simply by periodically sharing concept artwork, behind-the-scenes stuff, short developer diaries..literally anything of that ilk would have better than the months long periods of silence followed by the cringey Panels from Hell.
I love cinematic dialogue and that is one of the reasons I got BG3.😊
I understand why people find it appealing but it is also responsible for the lack of dialogue options available to our PCs. Sadly, it is a very obvious case of style over substance.
