The bug listed t here is the level 6 crew missions returning less materials than intended, not the lack of mission types withing categories.
That's all that's changed recently, the lack of reasonable distribution of mission types, for some definition of reasonable, has been going on since beta. I haven't noticed any real changes in the distribution of the mission types in the 1.4 patch.
The reason that the artifact-grade mat prices has gone up on the GTN is because of that bug. The most consistent source of those mats is suddenly returning half as much of those mats as it used to. Supply has gone down without the demand going down, so the price goes up.