How much healing is needed after a Dire Call if you layer the raid with SS?
How much healing do you leave for the other healers if you preempt Iron Qon's Unleashed Flame with either PW:Shield or SS?
How out Lei Shen's Thunderstruck?
The only fight whereby Disc effectively suppresses the other healers is Horridon. There still is a lot of raid damage to heal up on Iron Qon and Lei Shen.
There's a reason why throughput healers are doing so well on fights like Iron Qon, and that's because the sustained output from the throughput healers are easily 10-30% ahead of Disc's. It's something people tend to ignore, but Disc's trade off for being great at fights with one-off damage is its lower peak sustained output.
You'll notice that I gave specific spells. Suppression happens on many fights; it just doesn't happen throughout every phase, and things get the chance to level out on most.
We've gotten better, and right now it's not out of hand enough to be a problem, but it has been an issue in recent history and can easily be one again.
Then why are you trying so hard to convince everyone it's a problem?
Please point to where I've done that. I've contributed two main thoughts to this thread:
(1) Absorbs are not currently a problem, but have been and can easily become so again. They should be monitored carefully, and something should probably be changed in order to better balance absorption with healing.
(2) Regardless of whether Spirit Shell is necessary, not using it or making very little use of it for a mechanic for which it's essentially perfect is nothing to boast about. There may be less of a tradeoff at the 10M level, but I've seen Dire Call drop people perilously low on occasions where a SS has been missed or mistimed. On the topic of other cooldowns being suitable: sure, but none of them are on a 1 minute cooldown.
I'm also going to point out that, while Volios is right about the DPS/execution check, a DPS saved after making a mistake because you've used Spirit Shell is going to provide a heck of a lot more damage than what you're going to do in up to 15 seconds.