Don't forget the Windows NT configuration consoles like MMC, and other 9x configuration dialogs not accessible from the control panel, like the one to show or hide desktop icons.

The reason for this is that there are still drivers for old hardware that hook into the old control panel elements to actually function.

If you get rid of the control panel applets, you break the drivers.

This is also an old and out-of-date complaint. Almost all of the settings are now inside the Settings application and only inside the Settings application, with the related control panel applets gone.