Gender Transitioning Now Canon in 40k! And Sadly Not Via Chainsword

Ah yes! when i think about GW Warhammer 40,000 setting i always first and foremost think "Basically today! where my gender is the biggest problem of the day!" Because surely in the grim dark future of the 40k universe the beleaguered imperium of man would have more then enough time and resources to snip a few unwanted winkies! Or so at least thinks the Black Library