That would remove most of the reason to even deal with the mechanic, though, wouldn't it? Especially in situations where damage would only be hitting one of the tanks at a time and raid damage isn't timed just perfectly to finish the DRK off (though, that would make for an interesting PLD synergy via Cover, at least).
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EDIT:
(Sorry; ran out of daily posts.)
Yes, which allows for breaking that barrier to be worthwhile, instead of just tagging out and outlasting it or using TBN+Oblation (20% mitigation for the first 4 seconds in this example, pushing you to an effective eHP of 31% health for that moment) to eat a further auto as necessary. If DRK itself didn't hold that capacity as to nullify that risk for a few seconds, I'd agree. But it does, and so for healing that barrier not just to be a trap, it must outlast the death-preventing effect. At that point, the more it exceeds LD's duration, the less normalized it will be to cheese the barrier, which will ultimately make LD more costly than it would otherwise, yes, but also less likely to go horribly awry and lead to the DRK's death. If it came down to it, I would rather reduce the barrier to 50% HP or have it instead fade over 30 seconds (so that it's down to at most 67% left, naturally, by the end of LD) than make useless any incomplete progress towards depleting it.
Such was the point, no? To not fundamentally change the ability outside of causing it to no longer damn near guarantee the DRK's death?Nothing about the way you've reworked LD itself works to alleviate the burden it has on healers, only mildly reduce the penalty for having spent all of your resources and CDs before LD was popped.
Otherwise it relies on the DRK having... not spent all of its resources and CDs before using LD as a last resort like most tank immunes.
The amount to be healed is now clearly marked and failure leaves the DRK vulnerable, not dead; that's all. It's still a resource hog (though it certainly benefits from DRK's being able to heal for half its damage dealt over that period) because I'd not intended to change that in a minimal adjustment.