Linux has the exact same feature, and has had it since approximately forever. By default, 5% of the disk space on any system partition is reserved for use by th

Linux has the exact same feature, and has had it since approximately forever. By default, 5% of the disk space on any system partition is reserved for use by the superuser after the main 95% portion is filled up. And system updates run with superuser privileges, so... ¯\_(ツ)_/¯