This datapack adds a new way of seeing crafting on Minecraft. Indeed, it allows to craft items impossible until then, and to add the possibility of uncrafting most of the items.
This is why there are currently 43 crafts but above all 440 uncrafts.
There are still some items that can never be uncrafted due to the limitations of the current crafting system.
Therefore, any items that may have durability cannot be uncrafted.
But there are other items that can't be uncrafted because it would ruin the rarity of the item, so sticks can't be uncrafted in bamboo and basic rails can't either because iron wouldn't be worth anything after finding a mineshaft.