I have 2 problems with crafting. First is that I have found next to no crafting recipes for armor, weapons that are of use past Act 1, and none at all for kombi-skillbooks. The other is the massive amount of crafting materials that I am unlikely to ever use, but hang onto just in case.
What I suggest is that some quests give recipes as rewards and that more armor/weapon/kombi-skillbook recipes can be found on bookshelves, carved in stone tablets or some such. I get that you are supposed to try out different material combinations to by chance find something that works, but I find no joy in such a tedious task and even with more recipes those that would rather try out can still do that. Another thing could be, if we could deconstruct armor and weapons and in this way somehow learn how to make parts for other armors and weapons. Like if a piece of plate armor has a lot of constitution, you learn how to apply that to other armors by deconstructing it or learn to make armor that has a number of slots, which allow certain ways of combining different stats and abilites with the armor.
I really like the game, but have almost entirely ignored crafting outside of healing potions, arrows and spellbooks and that sucks.