Larian has statistics what races are most popular. I think it was half-elves, but I'm too lazy to look it up . What I do remember is a statement from Swen Vincke , long ago, saying something like " we gave you horns and tails, use them". But despite this encouragement for players to immerse in tailed and horned characters, it didn't really seem to have worked. Elves and half-elves and humans remained the preferred races;
While this may be true... One does have to factor in how well they were implemented and how interesting they were.
Many of these races were made "Humanized" so they weren't interesting and there's a lot of "Why would I play weird malformed human when I could play human?"
Then of course there's actual implementation of them. Dragonborn are ugly and weird. Tieflings tails clip horribly with everything. Small races are proportioned weird.
With finally, the last nail in the coffin... Many of these other races simply have fewer options. Races like gnome and halfling feel that they have much less available compared to elf or human.
So while yes, the prevailing trend will always be towards human and humelf (As Divinities more distinct elves were less popular as I recall) due to most people like playing characters they find sexy or are more easily self-insertable. The way Larian handled other races didn't do them any favours. Of course, Ixal would also bring up the point that the majority of players are gooners brought in by goonerbait marketing so they will play characters that they prefer in sex scenes in much the same way the cast of companions are all sex scene compliant (With the one potential companion to go against that being cut).
