A few people choose to use non-Apple pointing devices. "Safest" to assume minimal functionality and let the user configure anything else.
And for new users (coming from Windows/Linux), safest to have default what they might be familiar with.
In the Windows-Linux world, the right click and tap-to-click has always been the standard.
Only macOS asks to validate it separately.
I don't know any mouse / trackpad with only one button (excepted the very old Apple ADB ones).
It ist still the case, and is still the case before you log in:
Right click and Tap-to-Click are inactive and you can't change it, since they are user settings.
It ist still the case, and is still the case before you log in:
Right click and Tap-to-Click are inactive and you can't change it, since they are user settings.
I have no idea!
I’ve been upgrading from one OSX Mac to another for over a decade, and my settings transfer when I upgrade either, so I don’t know what the defaults are. I think that’s a powerful testament to the high quality of OSX.