The test lets each user set their own baseline. If you are slow and make a lot of errors during the first 4 parts of the test, then if you are slow and make a lot of errors during the 2 that determine the bias level, it takes that into account. And visa versa if you are fast and make few or no errors. I honestly don't see your "good at Mario brothers" point, as if you are good or bad at the game is accounted for in the first 4 stages of the test. Can you link me something that suggests such testing, particularly the formal versions conducted in a lab, are as utterly useless as you seem to think?
Also, did you read the article fromarketing 538 I linked? It answers a lot of the questions you asked.
Also, did you read the article fromarketing 538 I linked? It answers a lot of the questions you asked.
“Eternity is a terrible thought. I mean, where's it going to end?”
― Tom Stoppard, Rosencrantz and Guildenstern Are Dead
― Tom Stoppard, Rosencrantz and Guildenstern Are Dead