(Of course, the Monster Hunter series does this right: you collect the stuff and there's a master artisan who actually handles turning it into arms and armor. You manage basic field maintenance (sharpening) but not production or major upgrades. That stuff is done by a specialist.)
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Maybe crafting mechanics can be refined so that it only goes so far as visual customisation, or poorer imitations of consumables.
It's not true, and it's not true that an adventurer act solo (knights and adventurers had at least one esquire to manage the inventory, mantain weapons and armor... and to procure food, services).
For this exact reason back in the day people had two or more playing characters.