Yeah but I wonder why. (Invoking `login` at the CLI in Terminal.app yields the same result as opening a new tab on macOS.) Trying the same on Linux says you ha

Yeah but I wonder why. (Invoking `login` at the CLI in Terminal.app yields the same result as opening a new tab on macOS.) Trying the same on Linux says you have to be root, and does not log you in. Anyone got a Linux distro configured differently that they can explain, or a *BSD they care to try and compare on? Is there any reason (security, 'correctness') to prefer one way over the other?