Most of only use 1080p to 4k monitors. I don't think an icon that is literally 1/8th the display should be thousands of pixels wide. Please make all the icons just 128x128. It is 1/10th the display, even super zoomed in with camera+. If there are issues with texture compression, you should leave that to the user to decide with the graphics settings mod whether or not they want higher quality textures manually.