That all changed – less than 45 days later – as Apple released the 15.1 update to macOS, which included the removal of the “Click around in System Settings” option to allow unsigned apps to run.
Now, in 15.1, when you attempt to run a non-notarized piece of Mac software, you will be greeted by a simple error message: “The application ‘Finder’ does not have permission to open ‘(null)’.”
Easier?