The buff to immobilize should have never happened in the first place.
Team fights are just distinguishing, in high level play, BOTH teams spend half their time not moving as they try to focus a single target.
Nerf it back to what it originally was, 1 stack max.
This mechanic is not fun ArenaNet, it rewards spamming and in teamfights it rewards teams that spam it the most.
Glue Bomb, Spike Trap and Muddy Terrain shouldn’t give 5 people all 5-6 seconds of immobilize.
If you’re insistent to buff immobilize.
Have the longest immobilize applied take priority instead of the previous setup of priority by order applied.
For example: 3 seconds from Pin Down won’t be reduced to 1 second in favor of a 1 second Glue Bomb.
Otherwise, 1 stack is already very powerful.
(edited by Nova Stiker.8396)