Pre FF-10 there was no Gameplay, either. It was a spell.

"Your rotation has nothing to do with the pet besides the part it has to do with the pet."

And guess what? Your rotation actually changes when you can use contagion.
Oh no, it slightly delays when I have to refresh my DoTs. Scary.

And yeah, I would prefer spells that call massive creatures to do nukes even over this. Any job system final fantasy (tactics for example, WHICH BY THE WAY is where our relic is from) does it better than this.