Just from looking at them, Tieflings look much more sinister and alien - and the Gith girl does, in fact, look comparatively "normal"
To be fair, Larian kinda chickened out with their depiction of Gith for some reason, and made them look a lot less non-human than they should be... there's even dialogue about their nasal design which doesn't at all line up with Lae'zel's fairly human-normal-looking (slightly upturned) nose.
I actually noticed that and was a bit confused because I thought her nose was perfectly normal. Thanks for pointing out that Githyanki are supposed to look slightly different.
I also want to point out that I still consider Baldur's Gate 3 a good game. I just think that with all the work going into fully voicing even obscure events (The squirrels complaining about the singing of the Tiefling!) you could shift some of those ressources to better world building. However, I do admit that this takes time and you can't just "buy" a good story, even if you have great writers.
