Nowadays, it's included for compatibility with legacy software. Initially, it was included for current software. How do you stop the latter from becoming the f

Nowadays, it's included for compatibility with legacy software. Initially, it was included for current software. How do you stop the latter from becoming the former? When do you make the switch? And remember, `/usr/bin/python3` wouldn't exist on your system (as more than a stub) if you hadn't installed the developer tools.