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EDIT:
Given our past interactions, I never thought I'd say this but...
I agree with Semirhage.
Mostly (I don't find SCH boring...but then I don't find WHM boring, either, just I find SCH more enjoyable, even if I hate Dissipation to the point I don't even have it on my bar - fite me!!

)
I know...I'm scared too. XD
I guess my thing is I'm a semi-omni healer (WHM, SCH, and SGE - AST is the only one I don't touch other than bumping up to level cap each expansion when I get around to it), so I compare and contrast them a lot. On WHM, I consistently feel like I'm missing "something". Like doing the Dead Ends final boss (the one "whose steps were light and quick"), it does periodic raidwides. While I don't NEED to mitigate them, I always have a mitigation up often enough on all healers...except WHM. I use Temperance on the first, then when the second comes around...
...
...
Nothing. Because WHM doesn't have a second thing. Asylum (despite the name) doesn't offer protection, and Temperance's CD is 2 minutes. WHM has no Succor equivalent to soften the blow.
While the party CAN take the damage, it feels weird not having a mitigation tool TO use when I do on SCH and SGE. I feel like even AST is better off because it has 2 party mitigation tools and a party shield so that's functionally 3x the mitigation tools/frequency of what WHM has.