To be fair, those keys are missing from many (most?) laptops. Certainly Apple laptops, which also lack the much-more-important Delete key (instead, they only have a Backspace key mislabeled "delete").
That's true, you can still type them using fn + up / fn + down, but it's not obvious.
That's true, you can still type them using fn + up / fn + down, but it's not obvious.