I'd like to add that they also need to make the face options consistent.

For example. Miqo'te face 1, the one I use, the tattoos to the sides of the eyes are optional, however the same tattoos are permanent on face 4. Why is that?

Overall I have the feeling that the customization options may be hindered behind the "sphagetti" code (or w/e excuse there is), because it seems like they (except for hair styles and face paints) were built with limited 'slots' not thinking about new future additions.

How do I know this? I don't, but the fact that just to add the so-requested midlander stubble they had to literally copy paste one of the midlander faces, and add the stubble as a permanent texture for it, speaks a lot.