I played DRG through all 2.0 and 2.1, and I've played MNK since then on my lalafell. I cannot think of a single encounter (pre-FCoB, I don't know anything about FCoB yet) where there is movement required by the tank that is not predictable. If you're talking about dungeon farming or something, that's different. Someone else getting agro would make you lose damage even if you weren't hugging the line. I don't get your point here at all.
If you enjoy positional attacks, more power to you. I already said they've always been annoying to me, not that everyone finds them annoying. If you don't have fun on ninja because of the lack of positional attacks, don't play it. That doesn't mean ninja needs to be nerfed into the ground.