It's clunky, you'd require a rotation to have a rouse/wd up for each fireball with both scholars having to micro manage EoS meaning either no Selene buffs through that phase or the misery of topping a group back up with several succor casts each on every other fireball.
Just as with a whm healing through infirmity, it's neither optimal nor especially pleasant but it's far from impossible. A whm will heal up the majority of that damage with a single button press, it's just easier.
Don't get me wrong, whilst yes I do agree that whm is a little rough around the edges I'm frankly puzzled as to why so many people have such a huge bee in their bonnet over Schs being the master race and whms being worthless by comparison. Yes there are situations where a sch leads the way, but for the most part my parser results are pretty much returning the exact opposite of this forum would have me believe.