Smells like a combination of bureaucracy and a rather interesting little glitch in the math... somebody observes that you could make an PRNG that works that way

Smells like a combination of bureaucracy and a rather interesting little glitch in the math... somebody observes that you could make an PRNG that works that way, somebody else says MAKE IT SO and before you know it, it's an NSA standard, even though it's obviously never going to work because it's incredibly slow and obnoxiously complicated. Bureaucrazy, as they say.