This has been something that has been brought up off and on again since early access. Personally, I’d have preferred far more voice lines for our protagonists whether custom or not.

I created a poll back in January that has has some discussion of the pros and cons in the thread that you might be interested in: https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=841301.

"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"