Nereo, LOL! I guess it comes down to the motivations behind the mortgage pay-off in the first place... Personal history, attitude, risk tolerance all comes into play. Agree the math favors the steady investing which is obvious, but "freedom" and "quality of life" have higher value to some, though they are not even remotely financial...
When one is climbing his or her equivalent of financial Mt. Everest, there's no dawdling about reaching the summit when you're meters away... Instead, sprint to conquer the mountain, breath in the smells of rarified victory at the top, and then move on to the next, higher financial mountain sooner!