Is it my imagination, or mythics are always pushed to the maximum tolerance of the Healer?
It seems people pull three+ packs of trash mobs and purposely ignore as many mechanics during bosses as possible, so long as their healer can pull through.
Once the healer starts using CD's (pain suppression, barrier, rapture, etc) the group recognizes the maximum throughout/tolerance that the healer can bear, and tone it done a single notch.