I think Dealing damage would overall only bring advantage to good pvp players. Leaving the players who already have difficulties with the new balancing system more discouraged.
Pros:
It promotes the idea of getting first hits which is interesting...sneak attack I assume would be more common.
Favorable for PvP fanatics.
It could make unused implant like rage have a purpose( with rage implant, receiving damage generates power)
Cons:
Players will always be on edge guarding from sneak attacks.
Unfavorable for casual players.
It will stall out fights( Coel players will be waiting for the strong skill to happen and prepare to run away more efficiently)