I think we need to refrain from the idea of applying the notion of passability to genetic females. It's like division-by-zero, and it probably loses us support... lest another genetic female challenges us to give birth, for example.
We also need not to confuse attractiveness with passability. Not being attracted to a genetic female is totally fine, but that is a different assessment than passability. Unless most of us pass with real hair, real breasts, no makeup, independently of clothing, without clothing, etc, we probably shouldn't go there.
( There are plenty of women to whom I am not attracted, with whom I would trade places in an instant ).
- L.