What nonsense. This is just an excuse for laziness, whining, and failure. As a woman who has been a lawyer for nearly 40 years, and has had her own lawfirm for 20 years, I have always used "he" and "his" as neutral pronouns, and "man" and "mankind" as generic nouns, and it has never held me back from anything. I detest the modern usage of coupling a single noun (eg, child) with a plural pronoun (their). It makes the speaker/writer appear illiterate.
I don’t mind saying “he or she” at all, but it is one of those points where the cultural marxists came in demanding this change and we all went along with it — why not, we thought? Maybe it was a good idea.
I’ve teased out what I think is one of the tropes of the leftists. Tell people they must do something they already do. Then tell them they must do something that they don’t already do, but would like to do. Then tell them they must do something they don’t care about either way.
Then start telling them they must do something they do not want to do. Frog in the pot.