I think the developers are wary of focusing on DPS for healers. It is basically just there for solo and filler between heals. They don’t want healers to be so focused on damage such that they neglect healing. The meta is already kind of doing this anyway, but it would be even worse if someone needs to decide between healing someone and getting the last piece of the damage combo completed. It would also be complicated to manage cards/pet, dodge attacks zones, heal, keep track of a damage rotation, make sure dots and regens are active, keeping up on cooldowns and oGlds and making sure to use ones that synergize together at the right times. Basically there is enough already for healers to keep track of that other roles don’t have to.