I sometimes play mixed vball rec leagues, the definition of a mixed league in our rec league here, says we "have to have at least 2 women playing at any time"

So maybe I think what they mean by "mixed league" is not a "Maybe Mixed League" but like "Definitely Mixed League" as in mixed participants being a strict requirement somehow?

A bunch of people here are conflating low stakes amateur sports with elite sports.

Mixed league works fine for your company softball team. Not so much for professional sports.