Mac and Gnome do too. I think somehow overlaying that it’s an executable and double-checking if you want to execute from a removable drive might be better techniques than worrying about file extensions which only help people who know what they’re doing already (in which case it’s common to configure the UI to show those extensions)

Color coding any executables in file managers (in an otherwise reserved color) should be a standard.

No. Colorblindness does not mean that one does not see any colors. There is only a tiny fraction of colorblind people who really cannot see any colors, and even they can still spot different luminances.