#7 - Feb. 19, 2010, 11:04 p.m.
Having everything benefit from haste or crit is a good goal and ultimately necessary to keep stats that are going to appear on your gear anyway attractive. We don't want to do that for every single ability yet because in some cases those specs don't need that kind of buff and we'd just have to take the damage away from somewhere else.
Haste is a mixed bag for dots or hots because it makes you cast them more often, using up GCDs.