Wow is totally a different level because not all classes get short cds for stun, interupt,slow, root and long silence duration cd or benefit of racial / talent with stun/interupt/silence time reduction, but in swtor cc are just dirt cheap.
The ratio of dmg vs heal, + interupted attack vs interupted heal is too significant where dps pull the highest margin in both.
The healing mechanics just too failed compare to dps classes. For dps the longer the fight stays, the higher dmg they get from ramped up buffs and procs that scale with most highest hitting attack.
Healers get miserable procs and insignificant ramped up buffs that make the heal look big enough to fit a small hat.
Then in addition of healers utility is a bit lack luster to fend off dps or even pull the fight long enough to make it memorable. Even with cds, not all of it useful at time against certain class. Eg. silence and interupt melee dps? No. only stun, slow and knock back that useful against them, while for dps any available cc will work wonderfully against healers. (in addition such as attack such as tumult / pummel that hammer really hard whenever they get stun, healers get nothing to boost heal for such occurance.).
Each class get either 2 dps tree and 1 heal tree or 1 tank or 2 dps tree. The robustness and choices for dps to swap to specialize and optimize their dmg is too significantly overwhelmed against healing class at the same time sharing so many utility that most dps has and only having healing utilites to keep 1 target to stay alive at 1 time in pvp.
In swtor general pvp terms, healers just an accessory and not necessity. I spec'd to dps and find my contribution to wz improved tremendously simply I kill faster and more, then I can heal and save as a healer.