It wasn't Obsidian, but their publisher in the case of Kotor2...
PoE was pretty stable and finalized for video game standards once it was finally released.
PoE had several game breaking bugs at release:
Like every other RPG PoE had some issues at release.
When I played D:OS I did not encounter any obvious bugs ( though some things seemed to be strange, but I was not sure if it was intended)
Others did though.
Just don't mistake your personal experience with how think were on a broader level.
