The advantage to have to sit still and wait for long casts to complete to deal any damage in PvP?
Instead, show off your impressive mobile ranged damage toolkit (pruned to the ground in Legion) and tickle that melee as he eventually closes the gap on you regardless and kills you in seconds. Then "go PVE" like so many PVPers have already chosen to do in this expansion.
While this list may still apply for mages and hunters, most ranged dps have had their mobile damage tools pruned into nothingness in this expansion and the one before it. While the "arms race" in the past was a competition between melee struggling for uptime and ranged kiting and nuking, we're now in an environment where...
- Melee uptime is noticeably higher. Melee gap closers and CC were not pruned or were in some cases buffed. Ranged lost CC and escape tools.
- Ranged (outside of frost and other outlier specs) can deal barely noticeable damage while on the move. Try nuking down a DH or rogue on the run as a moonkin.
- Ranged must "turret" and wait for 2.5s+ cast times to deal meaningful damage, allowing melee to close the gap without even using an actual gap closer.
- When that gap is closed, melee can button mash to victory and outdamage those 2.5s+ ranged casts with instant melee attacks.
There are reasons for the melee hate in Legion PvP. Stop cherry picking mages and hunters as the counterargument.