Describe the solution you'd like
Bringing 1.16.5 more in-line with later versions by updating to use the result of the cooking/smelting task for config value matching instead of the inputs.

Why is this feature needed
To provide a more uniform experience in-line with existing values like Crafting where it is based on what you craft not what you craft with. This also brings 1.16.5 more inline with later versions of the mod in functionality

Additional context
The work is really already done I am just raising this to track it in the issue tracker

#216 is also related to this work, by ensuring that downstream mods use appropriate tagging means that you will receive a consistent experience across mods with a simpler config. For example, Mekanism and Caves and Cliffs Backport both have Copper Ingots, by ensuring they both use #forge:ingots/copper means they will both have identical XP returns with a single config entry.