I'm certain it's been suggested before but I think that one should have to regularly hone axes, shovels, swords, and knives to maintain their quality. It might even be a skill requiring practice to achieve the best results. Besides, it would give me something to do during rainy or wintry days. It would be a skill that uses time but not a lot of energy, thus not very fatiguing. And it's more manly than making birchbark baskets...lol.