Why not just more DPS buttons? Raising healing requirements will simultaneously lift the skill floor whereas a slightly more complex DPS rotation only increases the ceiling.

Have you seen WoW healing? If you miss 1 GCD someone in your team will likely die from random ass unavoidable AOE damage. How is that even fun? Not to mention that the WoW healbot classes literally cannot function outside of instances.

I honestly consider hybrid healers to be an improvement over the old heal bot concept from almost 20 years ago. There are issues with the healers in the 14 but that ideology in a vacuum is very enjoyable.