You would distribute it anyway as one file, because you're going to pack it into something which does the install. i.e. dmg/pkg file, installer, Linux package,

You would distribute it anyway as one file, because you're going to pack it into something which does the install. i.e. dmg/pkg file, installer, Linux package, etc. I don't think I've ever seen a Mac app which consisted of only one file. The whole idea behind .app apps is that they consist of several files.