Not all apps are self-contained. There are plugins, drivers, extensions to the OS etc... That's why having an install script/uninstall script that the OS can re

Not all apps are self-contained. There are plugins, drivers, extensions to the OS etc... That's why having an install script/uninstall script that the OS can reference from one place is useful. Lots of install scripts also have repair functions, as well as options to modify the installation. Which is why having a my software control panel is useful.