The history of /sbin and /usr/sbin goes back well before Linux even existed, and a Linux-only filesystem hierarchy convention really does not provide an adequat

The history of /sbin and /usr/sbin goes back well before Linux even existed, and a Linux-only filesystem hierarchy convention really does not provide an adequate guide to it and the really complex way, which is not the same from operating system to operating system, that the world reached the way that things are today. There's no clue there, for example, to the history such as the /usr/etc to /usr/sbin move in AT&T System 5, or the /etc to /usr/etc move that preceded that.