People aren't asking for Healers to become DPS in terms of complex rotations or comparable damage numbers - they are saying that if damage is going to remain the most go-to aspect of content (thanks to very low healing requirements) then Square can do better than having said Healers resorting to mashing two damage buttons while waiting around for a moment where they MIGHT need to heal something.
Personally, I'd prefer some more DPS flare rather than piling on more damage to heal. One can make the content of all descriptions somewhat more engaging, the other is just increasing numbers so that you just do slightly less damage and more of the other. I feel sorry for people who tuned into my streams and enjoyed the sight of me glaring things to death, whereas I could go play certain other MMORPGs where Healers actually do have damage rotations, utility buttons AND their own healing buttons/strategies to consider. Riders of Icarus "Priest" is an example of this, as is WoW's Disc Priest, seeing as they both heal through damage. It is one of many ways to make it more engaging than it is, WITHOUT trying to fully convert a Healer into being a DPS that can heal.
I'm fine with WHM - also one of its most aggressive in terms of DPS.
It always was (and likely always will be) a case of 1-5 buttons. In ShB case: that is Dia, Glare, Holy, Afflatus and Assize. I miss AeroII, but it was just another DoT. Instead of considering uptime of two dots, I have more heals to weave between one-button less of damage, and it feels more active now than it ever did despite that one change, what with Asylum now being useful, cheesy fairy wings, ST/AoE lily on top of our standard, revamped MedII not lasting forever, a useful Planery etc. Holy no longer costs obnoxious amounts of MP, thus can spam it for days. As such, the damage may be slightly more brain-dead, yet the other buttons give back (even if they don't do damage and even if you don't need to press them as much as one might think while content remains low-heal).
Sure, it'll always boil down to: AoE? Spam Holy. Not AoE? Spam Glare, but the in-between is better.