I think CB is coming at this from the viewpoint that women's sports needs men to make it interesting (whether she realises that or not). Not MCW competing as women, but the imprimatur of male interest. Quite a common attitude amongst sportswomen.
But there are, or can be, benefits for women's sport of having safe mixed sport. It separates male athletic performance advantage from talent, IYSWIM. In a mixed doubles match, the acknowledged best player is as likely to be one of women players as one of the men - in fact, more likely, because more higher ranked women players play mixed doubles than men.
It models - or can do - respect for women's achievements in women's bodies which is good for youngsters of both sexes to see.
So I would cautiously welcome something like this for adults - but only if
- it didn't put women's safety at risk from men's greater power and
- if the women's equal role in team performance was baked into the sport - as in mixed doubles or relays. It works when you get equal numbers of each sex on each team, and all effectively playing the same role. In volleyball, or football for example, a male goalkeeper or central striker would give his team an advantage if the corresponding players on the opposing team were women.
A dominant player could push women teammates out. In relays, each team member has their own space to shine.
Finally, I also like mixed track relays especially because often the backup squad members get their day in the sun.