I'd rather have some healers better at sustained healing than others, some better at burst healing, better at single target healing vs group healing, shields v hots vs direct, etc.

Giving each job a strength and weakness gives each job an identity. The current design around healers in FFXIV is atrocious.

I went back to WoW and I'm having more fun healing on 7 different classes than I did on FFXIV's "4" jobs.