I've been saying for years that SE's job team either doesn't understand or care about healing. The interest just isn't there to do a halfway decent job of it IMHO. This isn't going to get fixed until Yoshida either gets replaced or hires out of the JP community.
3.0 was a subtle notice that there was an problem with the design process for healers and 4.0 pretty much shoved those issues in everyones faces.
At least there's two positives to take away from this.
Yoshida has literally no excuse for all 3 healers be in the sort of mess that they were come 4.0 now. And if nothing else, at least the healer queues will be smaller now <3