Why don't we give Silver Bolts a charge system?

9/11/13/15/17 second cooldown. Max charges, 4/5/6/7/8. Starts at 4 on respawn. You can only use it once per autoattacking 1/1/2/2/3 times on the same target - exposing their weakness. It becomes an active ability which you have to press to empower your next autoattack on that one target only. Increases skill required by a bit. She can actually run out of anti-tank rounds in extended periods of fights. Thoughts?
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