the hell does it matter what gender said characters identify as? Why would it matter if we had all types of Space Marines (yeah, yeah, lore, yadda-yadda, but c'mon...the Rubicon Primaris itself contradicts a whole lotta lore... it's 40k, its lore is as stable as melted cheese), or trans characters, or agender, or anything else?

tbf, I think you’ve kinda hit the nail on the head with that.

Why does it matter in 40k? It would just be irrelevant and therefore not worth mentioning or shoehorning in.

I know the whole “This games woke!” mob are obnoxious, but it does annoy me sometimes when there’s an irrelevant token character when the story doesn’t need it.

Do it properly or don’t do it at all. Stop chucking token characters into stuff just for mass appeal, it’s ultimately a disservice.

Make interesting original characters and stories that revolve around that, rather than trying to cram that into something else.