CC (unable to do anything except breakout, this include knock backs) will trigger CC immunity but it does not include root or disorientation. You can root or disorient someone for ever (PC or NPC)
Roots are soft CC. They are not effected by cc immunity. Encase has poor firing speed, problems with elevation and other various quirks I don't feel like listing. Encase is bad talons is good that's t
I left for 10 months after the B2P transition, and I always just assumed they removed CC immunity during that 10 months. I literally thought this was a (terrible, terrible) choice they made.
Uppercut is better to have in PvP since it has a CC attached, while Wrecking Blow is more useful in PvE where you can safely land your hits. I don't think that having additional effects for CC immune