Yeah it's been my worry, too. Ever since Swen said he's pretty much moving on to a new 'secret' project and that he's pretty much done with BG3 (of course that doesn't mean his team isn't done with it, but yeah, there is that).
Yes on the topic of Swen moving on: I think he already did a long time ago and is focusing on both promotion of BG3 and future projects.
That could actually explain why the ending seems like it has not even be tested: If he is central to the studio's ambition and ethos, it would not be surprising if the quality fall as he is getting further remote from the project.
