See there we are agreeing on something. So no matter if a 10% variable is required or no variable reserve is required, some will opt for the Darwinism rule and do whatever they want .
A search of the Low Fuel equals Mayday thread will give ample examples of where fellas thought it was ok to stretch the range of their aircraft, and how they were offended if they had tell someone they were eating into their 30min final reserve .
Since those that really need a rule to operate, don't use the rules anyway, why penalise those that do follow the rules with more restrictions?