The entirety of MacOS. The number of cases where you must use it "Steve's way or the highway" are legion. Changing MacOS default behavior involves one of severa

The entirety of MacOS. The number of cases where you must use it "Steve's way or the highway" are legion. Changing MacOS default behavior involves one of several mechanisms: 1. Changing a preference with a GUI editor. Only a small percentage of all defaults can be changed this way. 2. Changing a preference with "defaults write..." and hoping the change will stick the next time you upgrade the OS. 3. Change the default for one usage but it will revert the next time you do that operation. Many examples wrt how Spotlight searches work in the Finder. 4. You can't change the default at all. Example: Themes. Last time I checked there were two, and nobody can make others.