Today's hot take: /usr/sbin and /sbin were a mistake. Yes, there are things in /usr/sbin that only root can run. But there's plenty in /usr/sbin (and always has been) that could usefully be run as a non-root user, even routinely, and as a result everyone has it on their $PATH in addition to /usr/bin. So all you get is confusion about where a program binary 'belongs'.