I am leveling my 2nd scholar. I seem to remember recipes for tier 4-6 battle and warding lore being already in my crafting panel when I level to each tier. Now, the only recipes I get automatically with each new tier are crafting lore recipes. There are no NPCs that sell recipes beyond tier 3 anymore. I also happened to notice that you can purchase the battle/warding lore recipes for turbine points from the store now. I don't know if they were available in the store before they removed them from the game.
I'm guessing that this happened at the same time they doubled the cost of the task reset items in the store, and for the same reason.
Yeah, I just got my scholar up to level 5 and was shocked to see all the recipes disappear. Not sure if it was done on purpose or if it is just a bug, but there is another thread here on the forums I found when I went searching for answers that seems to point to it being a bug.