Well, I admittedly don't have the extensive knowledge in practice of football as you do. I only played from pop-Warner to HS. Could've gone to college on a scholarship but chose a different path.
Now, I've been a police officer for 6 years. I can't speak for everyone but I put my life out on the line every single day and rely on visual and audio cues to help me make sure that I come home at night to my wife and two kids instead of going home in a body bag while the criminals get the upper hand. I have been trained to react faster than say a 'normal' individual in such circumstances. Perhaps I was even born with a natural talent to have a fast reaction time and use skills of observation and study better than others. I don't know, but I do know that, knock on wood, I am still here serving my community and not 6 ft. under.
IMHO, the cadence is an issue. Whether it caused a multitude of problems or just one, isn't one problem enough? I guess if your looking at it like we have so many other issues, using a more complicated cadence could create even more issues so that justifies it. However, no one that I know of is asking to make a cadence that is so confusing that even players who have played the game up to an NFL level can't understand. Just go with a cadence that isn't kindergarten in nature. Try and spruce it up to say at least Junior HS. I am sure these men that have gone to college and gotten degrees can handle that.