Dps checks are implemented for a number of reasons.

The main reason is so we log on every week to cap esoterics, granting raid groups more power each and every week. Once they overcome their first wall, they will run into the next. Need more esoterics. Need more weeks.

Putting ACC on healer gear will ultimately ruin their current model. If they did that, they would have to tune the fights around healers dpsing.