And again it won't really change anything. The numbers aren't the problem, it's the design.
The healing numbers itself aren't the problem. It's the instances of healing damage. It's how the damage goes out.
They can tune Ancient Quaga to have 4x damage right now and it wouldn't change anything. It's still spiky damage.
They can tune Ancient Quaga to have less damage right now, and it wouldn't solve the problem. It would make things worse, since now you don't need to top up the pary as much.
What they can do is change it so that Thordin just casts Ancient Quaga 4 times, to fit the new healer design, but that require reworking the fight, because now the fight takes too long and the cooldowns don't line up, so now they'd have to adjust everything else. That's what I meant by "not feasible".
I'm sorry I have trouble understanding what your argument is.
Are you arguing that they don't need to overhaul content to fit the healer design because a single GCD heal can cover most of the healing?
"Nothing at all needs to be changed" is not the goal for an overhaul. If anything, I'm arguing that the "overhaul" that the game needs requires breaking the healer design that the game has relied on for a very long time.