What I would like to see in future monk!

[Eliadil]

The difference here is that under requiescat, you have a set amount of GCDs limited by your MP. RoF has no such restrictions and so depending on your GCD you could either end it too early or not be able to get Tornado Kick off. A better solution would be to have it be more like Life of the Dragon and Nastrond/Stardiver, so you can only use it under RoF, but it doesn't end it. Obviously, either way it is just copying another job and not adding anyting unique, which might or might not be an issue for some people.

I was thinking more of something in the lines of SMN's Dreadwyrm Trance, along with DeathFlare who ends the Trance when used. But your solution can work too, but needs to have a set cd on Tornado Kick, so peoples don't spam it too much. Or maybe so the goal is to have two TK in a RoF window, like Nastrond in LotD. But I admit that I prefer the first option, that isn't at least a copypasted version of another melee's kit.