I don't see why not. It's not changing things such that every mechanic will instantly kill you. It just means it's harder to get you back to full if you take damage, so repeatedly taking avoidable damage is going to increase your odds of dying, and maybe force both healers to heal more often.
If the most popular role is also the one with the most complicated job mechanics, maybe making it simpler isn't the answer to get more people to do the less popular ones?Right now, damage dealers are the most popular role. This means that complexity can be introduced to make the classes more engaging to play.
But, healing and tanking are both less popular. It seems that SE's strategy has been to keep these roles less complicated so the roles aren't so intimidating. In addition, do we want more complexity put into roles in which our character survival depends?
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I mean, it doesn't have to be top level complicated. Tank DPS rotations are more complicated than healer DPS rotations but still not overly complicated. They manage to be that while all the tanking tools are in place at the same time. Tanks doing DPS are often also tanking at the same time, so they're a compliment to the job's primary role (because damage = enmity). Healing is unique and weird in that healers that are playing optimally will spend half (or more) of their time not doing healing at all, but doing DPS with extremely simplistic mechanics. When they are healing, again it's simplistic because things like MP management are barely factors and spell cast durations aren't really factors at all. You can go directly to your big heal, burst heal everyone to full, then go back to DPS.
Compare to other games where you have faster cast smaller heals, slower cast large heals, MP efficient heals, inefficient but high HPS heals, and so on. You need to manage your MP and casts to get out the required healing before more damage comes in without running out. It's more to juggle but also more engaging.
We theoretically have some of those things, but if you look at Cure vs Cure 2, at 70 there's virtually no case when you want to cast Cure. The most valuable resource you have is the GCD, both spells cost exactly the same time, MP is basically irrelevant, and one of them does nearly double the HPS of the other. There's no decision to be made there, except maybe "use Tetra instead and fire off another DPS spell" if Tetra's available.
Ultimately, THAT is the core of the problem. There's no room for a healer that heals especially differently because the only resource that matters is time. It clearly can be done because a lot of other games do it. It would take a rework of how healing works to do it, so we won't be seeing it any time soon. Until then, I don't see how a new healer won't wind up like AST: healing the same as what we already had but with an extra thing added on.
If they intend to keep that system and expect healers will be spending a lot of time DPSing, they should put more effort into it aside from "put up DoT(s) and mash your nuke", which is kinda what it comes down to now.