The only thing I could think of is the bst update which allows you to heal your pet at a noticeable rate. Familiar lasts 30 min on the mob, during which time it gets an HP boost (10%) and can't un-charm until the 2-hour wears off, but your pets don't zone with you so it's kinda pointless...
on top of that every other 2-hour lasts only 1 min or less (and some even instant) and the 2 new jobs' 2-hours also seem to fall into this category.

Might be something to do with the expansion? I guess we'll see.