Guess it depends on the flavor of admin. With some regularity a linux admin "with decades of experience" will show up and announce that openbsd is terribly broken and nothing works, not even the most basic pkg-add command. Uh, did you mean pkg_add? See! Openbsd is so broken they called the command pkg_add while I typed pkg-add. I've never had this trouble with linux!

I'd be worried about letting such a person admin linux servers, but I guess you can limp by as long as you keep your infra to what they already know. Ideally you'd weed such people out before hiring, but maybe if you need to hire an admin you don't know enough to do that?