Why Freeze is still 12s root when tribind is 6s?

[Nidelia]

Seriously I don't get it. Blm has already massive cc abilities, smn had one (add pet stun and bump if you want...) and they nerfed tribind because it was "too good". But freez is even worse thanks to the centred on target macro and the fact that you can still position it how you want if needed (not even counting that a 12s root is no matter to joke so you kinda want to depuration it... Owww now you sleep 12s and can't do anything) and kept the 12s duration.
Does it simply because smn was under uproar and blm not that Freez wasn't nerf? Or dev have a legitimated reason to not nerf it?
Because I was thinking that tribind was nerfed because it was a "spammable" aoe root but another skill which can do that is still as op. It makes me clearly think that the tribind is an arbitrary nerf. Nerf both or nerf none, but the actually situation is cleary unconsistent