In STO dps > all. Especially since s4. By the time you root someone, or stun them or spam half a dozen debuffs on them the tac would have killed them with raw dps. Expose / exploit is now pointless and unused. Raw dps is better. S4 was a huge nerf to sci and huge boost to tac.

Only use for sci is keeping your tac team mates alive in fleet actions. So that they can get the first prize and you can get something worthless. But, honestly, healing isn't really needed in a group of more than 3. Basically sci is a waste of time for ground.