Very true. I had a thought of something along the line of Protection, which uses your reaction, but in an offensive fashion...
Tactical (Fighting Style)
When a creature you see that is friendly to you makes a weapon or unarmed strike attack, you can use your reaction to grant advantage on the attack roll. The creature must be able to see or hear you to gain this benefit.
I like the idea, but it sort of steps on the toes of the Battle Master's Commander's Strike.
Too OP? I am worried primarily about rogues with elven accuracy now getting more chances for sneak attacks.