I thought people might be exaggerating about SMN

[Daralii]

I find it amusing how people claim that Summoners rotation at 60 is "the same" as it is at 90 as though the majority of jobs don't also work like that.

By 60, 90% of the core job rotation is in place.
MCH is a perfect example. Between 60 and 90, All MCH gains for single target is Potency upgrades to existing parts of the rotation with the only major addition/alteration is being able to use Barrel Stablizer specifcially to handle Wildfire windows instead of needing to hold Heat for it.
You get exactly 1 GCD between 60 and 90.

Dragoon is quite similar, with the majority of its additions between 60 and 90 being upgrades to existing parts of the rotation. The only big change is the addition of Mirage Dive, which is mostlt just something that gets weaved into the existing GCD rotation.
So again, a job with 90% of its core rotation at 60.

MCH is also criticized as being a braindead job after it received its lobotomy. That's a poor example to start with.