Hey mr Lore!
Have you ever raided on your rogue as combat? I understand your point of view, that we can just wait with using it untill its safe, but in a heroic raid its almost never 100% safe to be unable to control your toon for the next 3.5 secs and not knowing where the hell youre gonna end up when it ends. It really needs a fix or at least a "handle with care" label, yes the risk gives the ability some flavor, but the risk is too high in this case.
Imo a nice fix would be a glyph, you would stay on your current target and would be able to control your toon while casting, but it would do less damage.
Im not looking forward to your videos to end, I hope blizz will say "what you do now is so valuable to the community, so you should keep doin it".
But im happy for you!