They don’t want healers to be so focused on damage such that they neglect healing. The meta is already kind of doing this anyway
If the first part was remotely true, they'd be keeping bigger tabs on Healer DPS in content (which, from my understanding, they think little of right now). We're pretty much left to our own devices on that score.

There is a large difference between [low healing requirements coupled with big opportunity windows to use existing damage abilities via design] vs [community expecting Healers to use those to the team-advantage every chance possible]. I don't see how anything in our present meta is related to a supposed desire from SE for Healers to be more or less focused on damage in any way. As it stands, we're simply in a brilliant position to do so because of how content typically works, and this is rightfully expected of us while it remains the case (with the only alternative being to stand idle).