Thre's a reason for sizes
If you made sheet or wire then you'd understand what the gage systems are for. Elves do not just magically produce those goods after all. So mortals are compelled to work within the practical physical limits of materials. Each gage graduation is based on the draw strength of materials. Thinner wire and sheet is made from thicker wire and sheet. The gages are the steps between each drawing. Or in other words you get what we can make. I'm sorry if the numbers do not align with what you consider to be proper either. But that's just how it all breaks down.