As an industry we basically have no idea how to hire coders. Worse, copying interview practices from the big tech companies is rampant, even though the big companies are by far the most dogmatic of them all.
Remember when asking "logic" brain teasers was believed to be highly correlated with programming ability? Why are manhole covers round? How many jelly beans are in this jar? Why is this lightbulb so fucking warm? Not so long ago these were serious interview questions.
Then the big tech-cos moved onto simply making people scribble algorithms problems on a whiteboard and everybody else followed unquestioningly.
There is shockingly little self-reflection when it comes to tech interview methodology, and for an industry so obsessed with proving assumptions with data, we also do very little of that. Most interview "best practices" are accepted on faith and their validity is literally never tested.
They have extreme prejudice in favor of attributes that do not impact performance.