I edited my original comment. The "It's a bit jank" part is still true though. When you enable running your app on macOS without compiling specifically for macO

I edited my original comment. The "It's a bit jank" part is still true though. When you enable running your app on macOS without compiling specifically for macOS with Mac Catalyst, it still uses Mac Catalyst, but transparently. So, you still get all the issues of Mac Catalyst, but without the compiler warnings. Your application may crash or behave strangely.