> Arguably, random number generators that are ill-equipped to generate high-quality random numbers shouldn't be used at all. For anything, cryptography included.

For modeling you might want very large quantities of random data. It's handy if you can reproduce those same numbers at will. This is a bad quality for a cryptographic random number generator.

"Good enough" really is good enough for many uses. Obviously, that's dangerous for crypto where we want "actually good".