>>149943555
Congnitive tests are there to detect outliers. The difference between some guy having a 50th percentile wonderlic or a 60th is not significant but when someone has a 90th percentile score you know you're dealing with someone unusually sharp and when someone gets a Lamar-tier "well, you spelled your name correctly" score you know they have some mental deficiencies.
Regardless of whatever other talents you have, being hyperintelligent is usually beneficial and being functionally illiterate is usually not. It's not that you can't have some success even as a retard, but any sort of severe deficiency, physical or mental, is a liability that may limit your upside.
Vince Young had all the physical tools but never made it over the hump, in part because he was just dumb as a bag of bricks. Kyler Murray was bottom of his class and he infamously had to have film study written into his contract because apparently he wouldn't do it otherwise. Deshaun Watson was bottom of his class and, well, we all know how that turned out. Lamar Jackson is probably the best case scenario for an outright dumb qb and his career will be defined by a chronic inability to sustain drives against good defenses in the playoffs. Stroud had a good season once and we have no idea if its sustainable. Everything people are saying about Stroud is the same shit they were saying about Watson a few years ago. If you have 11/10 athletic ability being mid IQ might not kill your career but it probably shortens it little and will manifest in some negative way at some point. If the most important player on your team is shortbus-tier, you'd at least want to know before drafting them so you can make an informed decision