1. Rider ~ Uses Fronts 100% only.
2. Profiler ~ Uses both brakes.
3. Squid ~ Uses rear brakes alone.
5ft. vs. 140+ feet
Now, you gotta figure the ragayzine riders are what; Mid pack if you threw them in a race? So, someone that is a front runner could chop off more feet than some ragrider. They studied journalism. Besides, most are not seasoned pros kind of skilled rider. The ones that are getting paid for racing, not behind some desk with a deadline should be at that lever.
I don't know how you see braking, but 5 feet worth of plow into some fender is less plow at 100 feet of you; still trying to stop. And it's true. Breaking front or rear brake only is as bad a habit. It becomes real easy adapt to.
Practice makes perfect they say...

Right hand ~ Right hand. But, to each to his'her own capability...
Brake Check.wmv - YouTube