Yeah this gets into how on macOS, applications != windows and instead, windows are hosted by applications, and while it’s technically possible to run multiple instances of an application, in practice this is almost never done outside of debugging-type situations. If you have, say, multiple Firefox windows open, on macOS they belong to the same parent Firefox process while this is not necessarily true on Windows and Linux.

This turns every launcher into a switcher if the app in question is already open. Even a two line AppleScript will behave this way.