Other than the obvious... https://www.youtube.com/watch?v=GCDT4bNLla8
Imagine a DPS fucks up and needs to be raised during a fight, he raises at a VERY BAD TIME, and an AOE is coming out to kill him again, being able to aldo the DPS before the raid damage takes place saves him from dying again.
That is just one example, I can think of a dozen other examples where higher SS would help out with healing.