So you want to move fast? Speed is just fun in WoW, especially when farming old content like dungeons or raids for mounts or transmog. It’s fun to just zoom through the zone, killing and looting everything in your way.
During Legion, it was easy to farm a speed set for your character. And a lot of people were doing it after watching Asmongold with his 170%+ base movement speed set. Legendaries made it easy as some had huge increases to movement speed.
Now in BFA, it’s a bit harder to get movement speed gear, but it is still possible to move fast.