Because (1) there is no quick and easy fix, and (2) if you want nice things for RoK, I simply don't have time to look at it right now.
That said, T8 loams will be a bit more used in RoK recipes. But there has simply not been time to look at anything not RoK for well over the past month. Excess loam may be an irritation but leaving things out of RoK is going to be a good deal more than an irritation to a good deal more people...
Incidentally, the answer to this question can always be found in the
State of the Tradeskills post ... in the section entitled "What I'm doing this week instead of fixing your favorite pet peeve"
LINK