Warlock just might as well not be able to enter pvp, they have the worst of everything.

No notably high power exotics, while titan can get away with overshields on kill

Worst crouch, rift leaves you vulnerable when casting and unless you take arc it's actually worse than titan, let alone match the utility of dodge.

Worst grenade, not a single one can kill any person outright, titan and Hunter have several and hunters get invisibility (because you should be able to have that in pvp)

Worst supers, doesn't get the same survivability, has no mobility on them, and lower range. You'll die before you cross the room.

Literally nothing about warlock ever gives him advantage in crucible. At best, arc soul is a minor help to whoever has it, but it lasts 13 seconds unless you camp. I find crucible actually unplayable because of the strength distance in classes, as if I HAVE to make another class character to be able to play.