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If rationality is unnecessary, and leads to flawed results, then why the heck are theorists obsessed with fundamentally rational theories?
It's about being objectively rational vs subjectively rational opponents. For example, look at how gtorangebuilder calculates the best strategies: by putting starting ranges against each other and finding the comaxexploitive strategies. These are not necessarily Nash Equilibrium strategies because the starting ranges are not necessarily correct, but by calculating the best strategy given a set of starting ranges, gtorangebuilder finds strong strategies. Of course, these strategies are non maximally exploitive vs non optimal opponents, but they're quite strong nevertheless.
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In poker, what is driving the supposed inefficient exploitive players to behave more like econ bots?
Necessity is the mother of invention.