Comment by blacksmith_tb

Installing is varied on macOS, but there's certainly a default way to uninstall applications - just drag the application to the Trash. That said I have some sympathy for your complaint, since things that have you run an installer can sprinkle themselves all over the filesystem, and though they leave a trail, there isn't a standard way to reverse that (I find AppCleaner pretty handy for removing all the parts in those cases).