monkey see, monkey do I say, prostock is regulated big money with big-money sponsors. Who's goona plunk down sponsorship money on what is considered unsuccessful or obsolete? Doesn't matter if thats the truth or not! If everybody is winning with brand-X motors, type G chassis and formula D tire then the competition is gonna do the lazy thing and imitate or they'll get regulated into it and by then if somebody inovative comes along and starts smacking butt and grabing money they get legislated out of existance as being unfair or cheating
Take nascar for instance, I dunno if they mandate a 9" rear using stock architecture, but a 9 inch rear is incredibly strong at the cost of some driveline efficiency. Those ding-dongs could either change the architecture or try a more efficient design like oh, say an 8.8 or a GM 12 bolt and transmit a bit more power though. Say for instance to illustrate matters an 8.8 or 12 bolt is about 4% more efficent, then say you have a highly tuned engine making 750 hp, well 4% equates to about 30 extra hp, thats 30 hp that could be used to propel the car faster.
Would they? No! nobody is willing to take a chance on an untried component or the time it would take to develop it, and the gestopo that make the rules would probably ban the alternate rear end in the interest of competiive racing or some such BS like that
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