When any weapon skill (a,b,x,y,triggers) are used all other abilities are put on a 1 second cooldown.
ie: a skill with 1 second cooldown is used all skills are put on a1 second cooldown, a skill with a 6 second cooldown is used all skills are put on a 1 second cooldown.
In its current form, the perk is not playable. From it more harm than good, especially after accelerating the gameplay.
But your point is right, the Tactician perk became less useful after the changes. I will talk to our designers about some modifications on the perk.
Tactic perk selected. He was changed in the patch, +1 second to the entire cooldiwn. Put something else instead.
Global cooldown will remain in the game but slight changes (like lowering the CD to some degree) may will take place.