This interview reveals that the reason face sliders weren't added to BG3 was because, in games with sliders, players would generally create similar-looking faces to one another.

https://80.lv/articles/larian-explained-why-there-are-no-face-sliders-in-baldur-s-gate-3/

Excuse me, but...so the fuck what? Who cares? Does it affect Larian's bottom line if players like making generically attractive faces or something? That's why we're stuck to choosing between only ~8 heads?

The fact that genitals apparently get the same level of customization as faces do is particularly hilarious. Apparently your junk deserves no less attention than your face does, despite your face being visible at all times.

This is a silly reason to not have face sliders. I really hope it was just a bad excuse to cut down on development time, because the reason they gave is just absurd.