Basketball officiating has always been more subjective to me than in any other sport outside of the ump behind the plate. A lot like judges when it comes to interpretation of our Constitution, strict interpretation and bending it to fit today’s ideas.
Maybe if I had worded it differently, you might see why. Like a ball in baseball, the pitcher must perform the same motion, complete stop etc, trying to trick the runner. If the shooter takes 15 shots without contact and never once kicks his legs out, but on 16th shot he does, he isn’t going to get the call.