I disagree with this thread, the whole point of levelling in low level areas is to help friends, or map completion or cuz your too qui shy, it’s not to farm mats. When your getting the top tier of mats, you should be in the right areas already.
Plus what happens if you didn’t craft from level one, or you are behind, but the mats match your level instead of what is required. It wouldn’t work, at least you know which areas to for certain materials. If your lvl 80 and you start crafting you go to starter areas, if they scaled then you would get top tier mats.
The current system works, and the proposed system has too many holes and would require to much coding to deal with level of crafter, if person if has crafting profession when scavenging. Too many variables that make it impossible to work.