> The whole Mac idea was that there's no "uninstall process" with opaque windoze registries etc; what the Finder shows you is simple enough for an average user to understand. Like dragging an "Application" or a CD-ROM into the Trash to get rid of it. Of course they ruined all that with ~/Library/{Preferences,Application Whatever,Kitchen Sink}/.
The Windows registry is a simple key-value store, just like the macOS defaults system. Windows installers/uninstallers may create/remove some registry entries, but those are typically entries for file associations and the installed program list, and perhaps some global settings. But then the app is free to write its configuration data to any registry key it likes (usually ones named after the app), or to files in ~\AppData, or perhaps C:\ProgramData. Itβs not much different to macOS in that regard. The uninstaller may offer to remove the stuff in AppData, or it might keep it as-is.
(~\AppData is a bit less messy than ~/Library, because there are only three folders in AppData where application folders could go, but Library has all these folders with various meanings.)
I think on macOS programs are able to store data "inside" themselves, because .app files are just folders. They usually shouldn't put stuff in Library.
That's wrong, of course they should put stuff in the ~/Library if necessary. That's why if you update an app it just replaces the whole .app directory, and also if you uninstall something and then install it again all your settings will still be there.
The Windows registry is a simple key-value store, just like the macOS defaults system. Windows installers/uninstallers may create/remove some registry entries, but those are typically entries for file associations and the installed program list, and perhaps some global settings. But then the app is free to write its configuration data to any registry key it likes (usually ones named after the app), or to files in ~\AppData, or perhaps C:\ProgramData. Itβs not much different to macOS in that regard. The uninstaller may offer to remove the stuff in AppData, or it might keep it as-is.
(~\AppData is a bit less messy than ~/Library, because there are only three folders in AppData where application folders could go, but Library has all these folders with various meanings.)