Yeah I can, because I asked the question that way on purpose: I won't accept it because the devs themselves refuse it. So unless YOU can fix that then yes, your answer is invalid.
They aren't trying to see if it can be done elsewhere. Abyssos isn't unique to this "more healing/mitigation" BS. We had this in Shb. And guess what? They reverted all extra healing in the next tier afterwards and the start of this expansion. I don't doubt they'll do the same thing here. SE has a track record of this and unless the devs come and outright say that yes they're going to improve healing across all levels of content, MSQ included and actually have the gall to do so in 7.0, which has been proven for 2 expansions that they don't, your examples mean nothing.
Further, more healing isn't even a good fix. Good healers are ALWAYS going to have down time. Do answer why my down time has to be boring?
Also that is false that more damage buttons "isn't casual friendly". Casuals are people who don't want to do harder content. I would argue that more healing required is more casual unfriendly. The extra dps buttons are for the more expirienced healers who need something to do when they've met the healing requirements. This is why I keep asking you to answer the question, because you aren't giving an alternative fix to us having down time that we are guarenteed to have.
There is no way you are going to give enough healing in all forms of content to remove down time for a mid and especially hard core player. So again, what is your perposed fix?