"Travel to Australia is possible exclusively by plane or boat" is a sentence very few people would have a problem with, although you could also technically and

"Travel to Australia is possible exclusively by plane or boat" is a sentence very few people would have a problem with, although you could also technically and with great effort get there by swimming, blimp or hanging from a million helium baloons and hoping the wind blows the right way. In all discussions I've heard that mention "exclusive value" or a similar concept, the agreed-upon definition was always something like "where all others are orders of magnitude worse".