That’s quite a nice idea actually. Needs to be polished a little bit but i understand the concept of the idea and like it. Somenthing like crafting expertise. I could go on and say that adding diff types of expertises would be awesome.
Crafting a c4 for the first time has a chance of exploding in your face but after crafting lets say 20 c4 your crafting expertise on c4 go up and you have less change to explode or/and craft faster.
Having expertise on getting wood makes you get more wood from a tree at once or more ores at once ? having expertise on wood makes you refine wood better or faster and makes your shelter or planks more durable or strong ?
Quite a nice idea to discuss