More buttons doesn't mean more complicated. They simplified rotations because now it's easier to land OGCDs, so you can use them whenever it suits you instead of a fixed rotation that can be wasted due misuse of OGCDs, and you just said it; BLM will have more ways to DPS, so it will be easier to them to keep the damage up. No contradictions here.
These complains exists before every single expansion because people try to dig too deep and base their opinions on datamining/insufficient data. It's always the exact same thing. Nobody knows the statweights yet, and doesn't know the new potency formula, so all these opinions are quite invalid till we get our hands on the expansion.
And I'm still thinking the same way; healers needed some rework. Maybe we will get harder bosses with constant damage so we will need constant healing, who knows.
I'd just chill until the expansion instead of spamming the forums with complains.