Men aren't disposable. Noone is.
This is the problem I have with Paglia and the "philosophers" like her. They start of by criticising Marxism for being anti-human (and conflate that with everything left wing and progressive usually). They do have a sort of point in that classic Marxism had a very mechanistic (don't know if that's the right word) view of people. There isn't any understanding of the value of humans as individuals or the idea that the value of humans comes from the fact they are humans.
Peterson, Paglia etc criticise that, but are completely trapped in that way of thinking themselves. The answer to "what are men/women FOR” isn't "we need men to invent things and hunt and women to have babies" anyway. It's way more complicated than that and as has been discussed here the idea only men can invent things, provide shelter and food etc is laughable. But it's also a stupid question. And a circular one. If the "point" of women is to have babies etc then what's the "point" of the babies. If there is no inherent point in humans, them there isnt any point in the continuation of the human race so arguing that the point of humans is ultimately to continue the human race is dumb.
Its partly a result of "philosophers" thinking they are much better at science than they are. Scientists might talk about what's an evolutionary advantage. But "evolution" doesn't want anything. It isn't a conscious thing, or anything with moral imperative. I evolved to want to eat sugary food. That doesn't mean there is a moral imperative to eat sugary food or that my purpose as a human is to eat biscuits. But people like Paglia and Peterson use scientific sounding terms to make their arguments sound more intellectual.
And the problem with provocative arguments by the likes of Paglia is people then get drawn into debating the specifics. Because her central point that we "need" men because it would only ever occur to a man that the roof shouldn't legal is dumb. But that them provides fodder for people saying "you see modern society/feminism/etc think men are useless". On the other hand, if we agree men's "use" is to provide shelter that's not a nice feeling either.
Either you tale the religious view that humans are created in god's image and therefore have inherent value. Or you take a humanistic one that humans have inherent value. Or an absurdist one that lifes a joke and deaths the final laugh. Or you seethe in misery like Peterson and the other post-modern anti-postmodernists.
Finally, people quote the 80/20 thing a lot like it's some mathematical rule. It isn't. The person who first identified it didn't think it was. It's a very good way of predicting the approach of pseudo-science though.