Not suggesting that all is perfect, but I still strongly believe all of this happened in response to players (not saying all, but there were indeed some) asking for healer to focus on healing over damage dealing. In response you've far more healing options, few and relatively 'very easy' to manage damage spells. Which also aligns with Energy drain change.
When they first start expansions it's alright, mostly, because people don't massively over gear stuff and so things hurt. One of the problems healers have, as discussed before, is that as other people get strong their role gets less valuable and far more so than say a tank might be and tank being part of that group getting stronger. Higher defense higher hp, less important to need to heal urgently and often can be managed purely by oGCD (outside of very serious content). I know they mentioned coding errors being one of the reasons they're doing a gear squish, but given that they said unsync wont be as powerful in the end I've to wonder if perhaps they're going to try and address that a bit too. Although as an aside I hope they find some way to ensure solo unsync is still quite powerful, it's a feature I really appreciate (if they want to send it all to BLU that's fine, but then I hope they make pretty the 1-50 spells and generally smooth acquisition of key interesting abilities).
If in the end it becomes significantly more difficult to let people live on scraps till your oGCDs come bout, and healing is a more pressing matter, it'll be interesting to see those who liked "DD healer" over "healer first, maybe some DD". Although I would hope they do make one or more healers feel more technical, in different ways (like AST gets cards to dink around with), maybe another is more technical with their cures, while another has a more engaged damage kit, and then one more simple for those who like that. WHM, imo, currently being that more straight forward simple healer. Similar to how some DD in this game are far easier than others, depending on your skills and preference to keyboard dancing.