As briefly discussed in Discord....

Right now, I am working on tinker recipes, and personally I found them too rigid.

For instance, I'd like to create a recipe based on fuel rods, but I really do not care what fuel rods are used and it is extremely preferable that recipe should not tie to one specific fuel rod.

For instance, I'd say "(Fuel Rods:LVL 2~5) + Extra." But right now I need to create separate four recipes to cover level 2 to level 5 fuel rods instead of one.

Flexible recipes can reduce a lot of potential clutters.