What I hate about Exhaust

I mean by this moment shouldn't be an ADC spell but a Supp Spell, due to Windspeaker Blessing and the core healing masteries that make 16%-24% more effective when a support uses it. To be even more hard on this matter, sometimes is a lot better on the ADC, as it allows the ADC to select the proper moment to reduce the damage output of the assasin-bruiser trying to take him down and can be used to also amplify his damage due to the armor/mr reduction.