re: Offenses evolved to score more points. Defenses haven't evolved to stop them.

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College football

The substitution rule: Offenses can substitute whenever they want. Defenses can substitute whenever they have time.

The tempo rule: Fire when ready.

Exploitable? An offense that sets quickly can lock in the defense's lineup, thereby killing the same matchups over and over again all the way down the field until someone suffers a suspicious, dramatic injury or remembers what a time out is for.

Other concerns: Some claim to have injury concerns with fast-snapping offenses. But any safety argument against hurry-up football is an argument against football, so.

Pro football The substitution rule: Yes, there is one.

The tempo rule: An official stands over the ball like Colossus of Rhodes until the defense is good and ready. This is not done for safety reasons. Chip Kelly doesn't like it, as Mark Richt didn't like the SEC's similar rule when he arrived at Georgia after running the hurry-up at Florida State. And now look at Auburn! But, anyway, the NFL is slow.

Exploitable? Not especially.

Other concerns: Pro football is not extremely fun, but its players are well-compensated.

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