Dear Square Enix, do something with GCD healing please.

[ThorneDynasty]

They're one and the same thing.

Your weaponskill combos are a part of your rotation, they definitely aren't synonymous.

Not really, no. Until such a time as missing a GCD or two could cause you to skip an entire section of your combo, there's literally no effect on your play, only delay. That may be more punishing, or less punishing, than when all but 1 GCD in 12 has the same ppgcd, but if it doesn't ultimately create an competitive opportunity for divergent play...

Exactly. You are actually punished for missing steps in your combo in the long run. You aren't just losing just that GCD, because you want to avoid delaying your entire rotation too.

Nor will hitting a Maim, etc., a GCD late change the script you'd play by.

As you noticed I was talking about PLD and GNB, so why you keep bringing up DRK or WAR I don't know. Anway, if it's a step in your set rotation it's by definition not filler - filler is what you fill gaps with, the moments where you have nothing else to do.