It does let you run things as root.
What is "root" in macOS is more or less a power user role. Apple took away the true ability to operate as root a long time ago with System Integrity Protection which walls off the critical parts of the OS from the user entirely.
Unfortunately, SIP also restricts basic system functions that are trivial in other OSes. Apple made this very difficult, and MS would have loved to do this in Vista had they not received the backlash that they did.
For tech-aware people, it is probably not necessary indeed. However, given that now “tech-aware” people are running completely random and unvalidated scripts w/o second thoughts (or even first thoughts actually) on their main machine, I’d say the “tech-aware” line is very very high…