Oh come on, now you’re just feigning ignorance. Just because you take away the names doesn’t mean the dimorphic traits are absent. It’s a dimorphic character creation system. And the body types correspond to both modes of human sexual dimorphic presentations. And OP is taking issue with not just the veiled binary but also the hierarchy within it.

Let me put it this way. Imagine if the body types were no longer sexually dimorphic but had varied skin tones. And despite the fact that we know skin tones present in a variety of ways, they only offered light peach skin tones and dark skin tones. And they made the secondary one the darker skin tone. Maybe you or I would have a problem with it, maybe we wouldn’t. But could you understand why someone might take issue with that? It’s a fair objection to make, whether we can conceive of a solution or not.