Possible issue: Disparity with Living Dead and tank max HP

[EaMett]

Thank you. As I said, SCH is not really my class, so I don't have as good a handle on the possibilities in 10s as I do with WHM.

The point, regardless, remains the same - as long as the healer is even halfway competent at their class, there are always ways to handle the debuff sufficiently. It might not be pretty, and it might not be mana-or-cooldown-efficient, but it's really not as much of an issue as the OP seems to think it is.

Planned Living Dead is easy. Excog -> Recitation+ET+Adloq -> Lustrate to finish. Excog is 40k~, ET Critlo is 50k~. Most of the way done just with those two. Then a Lustrate and maybe a Physik if required. Union too.

For unplanned, like overpulled trash its much the same as above. I tend not to waste Recitation on trash early in a pull since its usually the latter half of the pack that gets dangerous when Tank cooldowns run out.
But I also do not use Energy Drain, ever. So I always have some AFs to burn when required. In the event of the fan receiving an inordinate amount of fecal matter, There's always Dissipation and triple Lustrate. We have 10 seconds to deal with it, and theres a LOT of healing we can do in 10 seconds. Worst possible case is none of the above available and we still have Dissipation into Physik -> Lustrate -> Physik -> Lustrate -> Physik -> Lustrate -> Physik. At around 15k~ per Physik and 20k for each Lustrate, just that is enough to clear it off.

Its really not hard.

In addition to what has been said right above. This also overlooks the fact that you would not have dissipation up in most unplanned scenarios as you would be using it pretty frequently in a personally optimized setting (using dissipation every other pack in dungeons, and close to cooldown in raids). A good SCH will always have some stacks handy but rarely a full 3 stacks AND either recitation or excog. You'd have to be really un-optimized or it's clear the tank is squishy AF and something's going to go sideways so they hold onto everything.

Besides, again, even if you stock up on everything and keep your tank alive, it's such a ridiculous amount of ressources for one invuln mechanic.