That’s the point - “jumpseat riders will only be accommodated at the captain’s discretion” is no longer in the FOM. The FOM gives us the responsibility to verify that jumpseaters meet the requirements listed in the book, and nothing more.

Refusing a qualified jumpseater simply because the captain doesn’t feel like having one on a long flight merely sets the captain up for a carpet dance. It’s no different from booting any other passenger or crewmember off a flight without a valid reason.