An idea I had once I hit Leathercraft 100 is that a crafting skill with a bunch of recipes should have it so that once you reach level 100, you learn (or are inspired) a bunch of recipes of that craft that are currently unknown, say like 10% of recipes. So say I have 595 recipes out of 1075, once I hit level 100, I could learn 48 recipes to help with the rest of the recipes.

Just a small quality of life improvement.