I've not claimed they want us to only heal, I think they've not designed it as a heal only game. And I don't think the Devs are trying to stop that.
What I do think is that the Devs don't want healers to be so DPS focused, because it's something they themselves have claimed they do not expect of healers. They have claimed they don't take this into account when designing raids and they don't take it into account for DPS checks and more see healer DPS as just optional.
Then you have Yoshi P's most recent statement that they nerfed Energy Drain because they'd rather have people focus their efforts on using their Aetherflow stacks on healing spells, not Energy Drain. Energy Drain added back in back people had an abundance of Aetherflow stacks and nothing to spend on.
I feel Yoshi's latest comments help cement what I've suspected about their changes for a while. Because it illustrates the same backward logic I've seen people use to defend the changes where I've seen people claim that it means that healers stop focusing on DPS and spend more time focusing on healing, which it doesn't do. I can see how one might think that by looking at them.
And that backwards logic is: if people have less DPS or fewer DPS skills then they will heal more.
Also, I don't think your solution is necessarily that simple and of course draws complaints from those jobs too and those tools have their uses in content. And I don't thing would make enough of a difference to have the effect you describe.
DPS healing mainly exists for emergencies. A RDM shouldn't Vercue unless it's really needed because you're sacrificing good DPS. Bloodbath is also used when you really need it as a melee, but I also see it get used for DPS to keep their uptime through AoE's. I don't see it get used that often. Curing Waltz and SMN's Physick do very, very little in the grand scheme of things, but may just pull from near death.
Tank heals can be a life saver at times, but you'll get unhappy PLD's if you take their clemency away.