Pyro mercs could use a boost too. At least 95% of the dps mercs I see are running in arsenal anyway (on po5 server).
In pvp I find pyro lacking the punch to take out a good healer without assistance. Not that it is easy in AP but I have soloed the same healers that just laughed at pyro. Especially with a tank guarding them AP flame thrower will burn the tank and the healer energy pool really fast.