Just for the people who don't know what the fuck securelevel is (NetBSD's flavor in this case)
Not going back to Linux, but this really is a worthwhile addition.
Furthermore, should something like this be omitted simply because Linus doesn't like it? Is his opinion the only one that counts? Among other things, securelevel is used to implement "jails" but the functionality can be completely disabled (securelevel = -1) -- so Linus can turn it off if he wants.
Is the direction in which Linux is driven simply the whim of people like Linus and Lennart who dictate "my way or the highway"? They are smart, capable, talented people, but not omniscient Gods - despite what they and some others might think.