possible, I just thought mini pins were more, Chihuahua sized. I've never seen one in person so I couldn't tell, I have a min pin jack Russell mix, but she favors the jack.
Same reason they do it to tails, absurd breed standards that serve no purpose anymore except allowing dog show judges to feel important for anything other than causing a false sense of superiority in people who pay thousands of dollars for a purebred (read inbred) dog.