I would love a database that simply shows missing recipes and where they are available/which mob is dropping them.

There were addons like AckisRecipeList etc. but they weren't even kept up to date. ALLTHETHINGS is completely overloaded.

You don't need much, but if recipes are missing, you would just know where to find them, which mob/quest drops them or which reputation/vendor. Without having to search on wowhead and co