The problem is that Electron, itself, is a macho binary and thus subject to the same architecture constraints as any other app. The "universal binary" the OP is

The problem is that Electron, itself, is a macho binary and thus subject to the same architecture constraints as any other app. The "universal binary" the OP is mentioning is taking advantage of the "fat" macho format, which bundles multiple target architectures in one executable, so the user does not need to know which they have in order to download the correct one. Or doubly so in the App Store where there is no "download the correct one"