Yes I agree haste is the main stat and you should stack stack stack it.
No I’m just laying out personal and statistical evidence that top and/or casual group leaders aren’t usually partial to Enhancement. There’s simply other specs that do as good or better without being chained to RNG, I’ll take an equally built Ret Paladin over you for example.
There are many factors you have to take into account when inviting dps for endgame keys. Enhancement simply does not fill a lot of check boxes for me personally. When I want to push a key, Enhance is not the first thing that comes to mind.