As both an artist and and a martial artist, I can attest that weapons skill is relatively easy to generalise, but craft based ability is not. For instance, while I can wield a spear and a sword with roughly equal facility, using the same general skill set, my artistic talents grant me no insight into blacksmithing. Put simply, most fighting follows the same general principles, while making things does not. Also, it'd be stupid for a master blacksmith to automatically be a decent painter. Sort of like Lore. A master swordsman on the other hand, probably doesn't do too badly with a spear.In my homegame I just combined all the craft skills into one skill. Then I'll make a special emphasis on special ingredients instead. I like it better because it takes the focus away from dice mechanics and puts it more into adventuring for a special rose that only grows in rich firedust areas in the far south and since firedust is frequently harvested the rose is now very very rare.
I've always hated melee covered any and all weapons, and archery covers everything from a bow to a ballista, yet craft is 7+ different skills all by itself.