Pro Stock. Then and now

Why even put an RPM limit on an engine. If they were blowing up at 11,000 RPM the guys would build them so they wouldn't blow up. Losing an engine is a costly problem and also prevents you from winning. So the racers would dig deep to prevent losing an engine. Maybe put a cost limit on the engine instead. I never even watch NHRA anymore after going to Englishtown every year and saw the Mopars in the winners circuit back then. We know all the fuel, nitro cars, are Hemi powered.