Gender locked race?

[Iscah]

Concept art shows that the males don't actually have the heel. So it might be less about support and more regards to their culture.

Actually, concept art shows them with digitigrade feet (heel off the ground), just not wearing heeled shoes to "support" it - which makes much more sense to me anyway, for both genders. They shouldn't have evolved that foot shape if they can't naturally support themselves on it.

I also suspect heels would interfere with a proper digitigrade gait rather than support it. From trying it out, it feels like your heels need to be able to move up and down, not have a heel spike keeping it X distance off the ground.