While working on RRV, I felt the need to expand c:hidden_from_recipe_viewers to the Enchantment and Potion registries, with the effect of hiding enchanted books and potions from the recipe viewer index. If there is interest, it would be good to add this to Fabric API/NeoForge directly so that mods like Enchantment Disable Tag or Enchantment Disabler can disable an enchantment in one place without needing direct integration with up to 4 recipe viewers.