The only time I’ve seen an asura with facial hair is one of those “mentor” PS characters you choose at character creation. Considering how hairless they are portrayed (aside from the tops of their heads) I think it’s a bit odd.
Sylvari, however, I could see with facial hair. One of the faces in particular (the one that Canach has) has thorns in a beard/moustache-like pattern. Considering sylvari are modled after humans, it would be pretty in-like with the lore.
However, I think the reason why Norn and humans have lots of variety (and the option to have) facial hair is because there isn’t much customisation outside of that. Sylvari already have the broadest customisation options because of their colour, glow colour etc. Because humans (and thus norn) are already familiar to us in the real world, it’s important to have a realistic variety of customisation options or else they’d often feel same-y. (In my opinion, of course).
In conclusion/tl;dr: Perhaps ask for some sylvari faces that appear to have beards/facial hair. I don’t think A-net will add an option to have a range of facial hair that can be applied to any face (as it would require an extensive re-work), but asking for an exclusive face is very reasonable and much more likely to happen.
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