I can only speak to the Mac situation, but most people there would not have "root" in the traditional sense:

* Pedantically speaking, you can not even log in as root, any root level access would have to go through sudo (which is indeed enabled for most users).

* But additionally, even as root, Macs by default have System Integrity Protection enabled, which makes most system files non-modifiable. Users still have full control in that they CAN disable System Integrity Protection, but that involves a reboot and some (documented) command line commands, so most users don't bother doing that.