NINs run on a priority system.

1. Huton (AC)
2. Dancing Edge
3. DoTs
4. 1-3 are already done and have nothing else to do? AE.
1-4a. Hit oGCDs whenever they're up. This includes ninjutsu (Suiton/TA > Fuma/Raiton spam until Suiton is back up).

The only "long rotation" you should be mindful of is the opener and that's because people have determined what the optimal sequence of oGCDs is when everything is up. Even then, you can just follow the priority system, botch the specific ordering and still do decent DPS.