User blog comment:Lykrast/Esdel, the fearless huntress/@comment-7709681-20140828170827/@comment-5686533-20140828173435

Well, Q with CDR and good team management with E can be spammed very hard, so a seconds stun on a cooldown that can be as short as 3 seconds (40% CDR + ally with 2 attack/s with the E buff constantly attacking for the 3 seconds of it (or multiples allies synched really good)) would be... really... really harsh.

While the ult was really a copy of, the simple numerical changes + the stun makes it completly different in therm of use. While I could remove the stun for another CC, it is meant to be a long range initiation to help allies set up ganks if you aren't near (because if you are near, they have 2 seconds to CC you, plus Q is pretty much more reliable if you are close).