The main complexity of a healer should be choosing to Dps or heal, but in ff14 you can do both at the same time. Which some people enjoy but I'd prefer actually having trade offs to healing rather then having like 10 OGCD healing skills knowing I'll be fine, managing them isn't really that difficult i find myself not using all those skills, so I'll never really "fall back" on GCD heals.

Personally I don't think healers need rotations, but they should certainly have possibly different dot timers (even more then one dot on some like scholar), gcd cast times, some might have proc skills, high costing mp attacks (which could bring back "mana management") plenty of ways to make the kits way more interesting. Ways to feel "different" dps wise from one another.

I'm mostly in favour of doing something, it's clear that healer design is very flawed for most content.