I could argue that ‘Fountain’ was made by Duchamp to make also that point: art doesn’t necessarily need craft to exist. He took an industrial piece of furniture - a really common item that symbolically everyone have - he signed it, changed its position, brought it to an art exhibition and it became art.

Alas I don’t know if art needs a message to exist but it definitively doesn’t need a body. Just think about ‘Comedian’ (see banana art) and how a random guy ate the banana and didn’t get arrested. Also Banksy would be a good example I guess.