So you hardly have any room to sit here and say guilds don't "feasably" chain raid cooldowns. Bubbles/sacs/tranqs/aura mastery ect.
Because they in fact, do.
My guild runs 2 disc priests at LEAST depending on the fight. Sometimes 3. They do not enforce bubble spamming, and don't care if you do or not. We still beat encounters just fine without it.
Those are all examples of fights where guilds chain raid cooldowns to mitigate as much damage as possible.
Don't sit here and make things up Spiritus. You have seen how many heroic bosses? TWO gimik heroic bosses. You know NOTHING about heroic content.