The entire concept of using JetBoost immediately after being Force Charged is dubious. Since you are rooted for 2 (usually 3) seconds after the Force Charge, your lack of movement means you negated nearly the entire benefit of the JetBoost's snare. Moreover the Vengence/Vigilance Warrior/Knights will be immune to ALL the effects of your Jet Boost at that time.
You are better off eating the initial damage and then then using Jet Boost after you are no longer rooted. At that point, then you can get some separation from the melee attacker.
Now if they changed JetBoost so that when you used it, it removed all negative movement effects (just as the Sorc Sprint ability does), AND allowed it to override Unstoppable/Unremitting, then you might be on to something....
You are correct, but you missed my initial point.
Jet Boost used to COUNTER smash by activating faster than smash itself, therefore it was more beneficial to knockback the warrior after they jumped to you so that you don't get smashed. Now they just keep nerfing mercs constantly non stop and the merc developer isn't saying anything because he is either very ignorant, silenced, or fired, not sure.