Not just unique though. They should introduce things we dont have / have little of.
We dont really haveany characters where fire and burn is tgeir primary focus. Theres only one character with cleanse. Theres only two that can anti-heal. Theres no ninja tank. Nobody with flame throwers. Nobody with two handed zweihander swords. No whips. No napalm. No smoke screens / nades.
Theres so many things we could get if blizzard weren’t terrified to try many new things.