Plus it's not turning bums into studs, these guys already had big talent they were just aging, if there is a way to slow down these legends aging process (which is what TRT looks like) then I dont see why UFC and any other sport wouldnt want to accept that. Kyle Kingsbury and Forest Griffin took it and were still shit, its more of a fountain of youth more than some cheat mode on a game where you +10 all your stats
Fighters only have a limited lifespan in the sport, surely if you can keep them at the top of their game longer ypu should do anything and everything to legalise, UFC is doing themselves a disservice by keeping guys like Shogun and Nog past their prime when they could still be '04 shooto smurfs