I will concede that the healing checks in SL were pretty sparse. There were a few of note in S4, which is evidenced by Hpriests ditching Kyrian for the support offered by NF (although Fire Mage being a more popular DPS option also came into play here). However, they’ve already made changes that up a healer’s responsibility, in addition to the fight profiles in DF dungeons favoring group-wide rot damage. I think they’re starting to overdo it, and the tank change affects both tank and healer spec balance.
Not to mention healers already filled gaps in tank mitigation. There’s a reason why Hpriest and BDK worked so well as a combo, despite their individual reasons for being meta.