Doesn't JJ2 count time in-engine in 70ths of a second, which would theoretically make >70fps gameplay essentially just artificially padded out with extra frames? Or am I just completely misunderstanding the way JJ2 works?

Anyway, these days, more and more gamers are accepting gameplay over graphics, and going back to the classic games from way back when. Games like Jazz are a perfect example of standing the test of time. Jazz stands up particularly well, as its graphics have aged really well. But, I think Epic's mind-boggling decision of never digitally releasing it is a big limiting factor, and probably the main reason so few people play the game nowadays.