Why can't people just accept it as another "Get out of jail" card in their tool-box?
Because some people operate in realities of practical world around them, I am not aware of a single NDB approach within 250 nm radius of my home base (frankly I doubt there is one left in my whole state of CA though I could be wrong). Yes, IF I were on low fuel and IF and IF ... there would have to be convergence of lot of IFs for me to ever consider NDB approach. And since FAA is decommissioning more and more NDBs every year it becomes almost a statistical impossibility that I every have a chance to shoot NDB, I probably have a higher chance finding myself at the North Pole. Also some people try to limit what's in their tool box to what actually they have a chance to practice in real aircraft.