This weird “non-binary” trend — my theory:

Really good for marketers, and capitalism.

Why? Non-gender clothing is easier to produce and sell.

Also not always, but many non-binary people prefer to *NOT* have kids, and also a lot of these non-gendered kids and people prefer to assert their individuality via their clothing and fashion options, thus once again — greater marketing, profits!

My simple thought:

Gender is fluid, sex is solid.