Backpedaling has its uses, especially in vanilla, and WoW has never been a game you HAVE to be good at (even retail). I say this as someone who has a video on my youtube killing Mythic Jaina and all the achievements poppin up that go with it.
Like, as a mage, especially playing with bad ping (aussie here), beckpedalling to kite is far more effective than strafing due to leeway + ms, and using wasd so your mouse is free to swivel camera/click stuff (like ZF GY farm).
I don’t watch streamers (well I’ve been watching fivex do pvp recently but he is just music and gameplay, no OOT personality/hating) so I’m sure what youre saying is in direct response to how they act, but being good at WoW means very little. Unless you’re retail arena pvp player ofc.