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Security through obscurity is a very valid way to secure something. It shouldn’t be the only way of securing something, but it can be a valid additional layer.
The knock sequence is a secret, just like a password. It may not be a particularly strong secret, but is is strong enough to keep out casual attackers. You’ll still need additional security, but sshd is well equipped to provide that.
You may not have much experience with spoiled teenagers.
Voicing ones opinion without regard for the people involved, just because they’re allowed to have one, is pretty much the spoiled teenager MO. Just like not realizing this goes both ways.