Yeah I think you're right to some extent. It's definitely harder to get invested in the ones with no or less VA. However, I think there's also something to be said for the tutorials/starts of these games. The Larian games I've played had relatively punchy tutorials that lead into a nice amount of structured freedom very early into the experience. Disco Elsyium also gets you into the the thick of things without much explicit tutorializing because it's so mechanic light your "tutorial" ends up just being gradual introduction to your main characters, the setting, and the case, which is what you're here for anyway.

The other CRPGs have hit me with the double whammy of tutorials that lead me by the nose for way too long while also just dumping paragraphs of exposition on me that have almost nothing to do with the immediate characters or plot.

EDIT: Thinking about it a bit more: While you don't need all the voice acting and cinematic to make good, dramatic, character focused story bits, I think the converse is true: It would have been a waste to get all these great VAs only to have them stand around and dryly deliver exposition. So it kind of had to be very character focused if it was going to work and be worth the effort.

Imagine how much worse the start of BG3 would be if you run into Laezel and you just stop for like 5 minutes while you exhaust all her dialgogue options so she can explain the entire history of the Gith and the Ilithid. Even fully voice acted that would have killed the pacing.