I guess im looking for a legitimate way, where smithing is increased doing some useful game process. Enchant is increased by using enchanted items, Alchemy by consuming reagents, armor and weapon skills by killing enemies. Smithing only through powergaming?
...please tell me you didn't level up Alch in Oblivion and previous, just by eating reagents (for tiny, tiny gain) rather than the much more logical/reasonable/rational/"RP" method - actually brewing potions.
As for "smithing only through powergaming".... me, I didn't buy materials from the vendors or "spam" (depends, of course, on your definition of "spam"). I gathered materials in the world, as I found them (ore outcroppings in the world, mines, bandit camp forges, etc), and then spent some time when I went back to town "practicing my craft", as anyone would do to improve their Smithing. I made things. Not just a handful of items that I used, but many things.
Yes, for the final push from Glass armor to Dragon (70-100), I made a concerted effort.... but that still involved hours of adventuring, as I went back over many of the mines I'd already discovered, gathering more materials. As well as hunting animals in the wild for leather & hides.
Finally hit 100 Smithing at level 48.
Didn't strike me as particularly "powergamey".
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random crafting anecdote. When I was at RIT, I took some elective classes at the School for American Crafts. It was interesting seeing some of the things that the Graduate students in Ceramics did..... yeah, they spent a good bit of time making some serious crazy "art". But they also spent a lot of time honing their skill - by making
vast craploads of identical pots and bowls. Generally very simple ones. Really helped them increase their control and accuracy.