A couple of my more cynical friends have commented that this may just be code for 'we're releasing evil/neutral companions first because that's what we have the most experience writing'.
It does kinda make sense, because the DOS2 companions are largely the same way, though they were all varying flavors of neutral rather than evil. Work with your strengths first before you try to swing at something new. I think the only one that could be argued to be good-aligned would be Loshe, and that's probably why she and Fane are among the most popular companions (and Fane was a character written by Chris Avellone IIRC).
Also, going back to the talk about how stuff from early EA shouldn't be taken at face value due to how much time has passed since then, those of us who remember the original BG3 announcement know that the controlled character's dialogue options used to be entirely in implied passive 'I asked about X' type of speak. It was so wildly unpopular that a ton of people slammed them for it, enough that Larian immediately changed course, although I recall a fair amount of people still defending even that.
I do wonder exactly how much of the script had to be redone due to that, though.
