Previously, the juggernaut trait gave the engineer stability while using the flamethrower, which was huge. Not only did it ensure stomps and revives would not be interrupted, it provided a viable alternative to slotting both a stun break and an immobilize break, which (according to the kids in the warrior and thief forums) is a requirement for “good” players. So now we really only have one utility skill available? I for one think it is ridiculous that HS and hundred blades should be allowed to dictate so much of an opponents skill selections, but Anet chose to go after stability rather than nerfing the obscene damage skills, so it looks like they think they are okay.
Sorry for rambling. With the current meta game, stability was the only alternative to slotting stun/immobilize removals. I hate having my builds so severely limited.