I just checked on my monk, seems I had wrong idea how charges work.
So without CTHC, if used on CD starting from 2 min mark and fight lasting 10 min, we'll lose one Deterrence. So in short, we need some kind of rip off monk T1 talent - add charge and lower CD or bring huge CD reduction talent. In fact, I'm not sure how they even thought this is the same as live in situation when Readiness is used to reset Det CD.