Since I got the impression you don’t play much arena, I thought you might talk about BG / open world PvP. 
Depending on the classes, the prune might have a lot more of an effect than you might think it could have. Especially on classes you might not be very used to.
Not really. It depends on who uses which button and when. Melees just often press their gap closers even in situations when they aren’t needed, while wizards using their escape buttons most of the time to get out of melee range.
That makes one button a lot more reactive than the other. So when you then use your charge while the mage still has all blinks, especially for 10 yards charges, you probably lose the mobility battle.
The issue right now is, that mages are just too tanky. Not only because all melees have a crazy time trying to get to it, but more because their barrier with 20 cd sec absorbs as much as karma. So when you finally got to the mage after forcing blink after blink after knock back after blink, they still have a karma on low cd or alter time if they messed up before.
But the prune is not only about mobility, a lot of other stuff gets pruned away from specs, that might have a huge impact. Warriors though seems to not only keep most of their stuff, they also got more.
I maybe asked that question 3 people in the past 12 months if at all. 