What are you arguing? The only myth is the rising fastball. Even there the blogger amir quoted is plain wrong. A rising ball is a reality in golf and it can be done with a speed less than a MLB caliber fastball. It's not about speed but a function of spin rate and velocity. It can't be done in baseball because of the physical limitations of the human wrist to impart that much spin.
You also aren't taking into account wind conditions. If you are pitching or hitting a ball, golf, tennis, whatever, into the wind the loss of velocity WILL cause a non gradual break. In golf new systems using radar like the Trackman simulate data very accurately, same for Supervision (lasers) have done for baseball. As for me, I'll take the word here http://www.popularmechanics.com/adventure/sports/a3207/1283161/ where they actually tested real balls than Amir's blogger who was testing flat discs.
You also aren't taking into account wind conditions. If you are pitching or hitting a ball, golf, tennis, whatever, into the wind the loss of velocity WILL cause a non gradual break. In golf new systems using radar like the Trackman simulate data very accurately, same for Supervision (lasers) have done for baseball. As for me, I'll take the word here http://www.popularmechanics.com/adventure/sports/a3207/1283161/ where they actually tested real balls than Amir's blogger who was testing flat discs.