Having that IQ requirement allows a person to hold those careers. To people outside those careers success is defined as holding that position for a period of time. Kind of like a musician playing a song or chef cooking some food. The performer(s) will have a much stronger (and likely harsher) opinion of their performance than their audience. So in a sense merely having that IQ, to an outside observer, is a determiner of success.
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Having that IQ requirement allows a person to hold those careers. To people outside those careers success is defined as holding that position for a period of time. Kind of like a musician playing a song or chef cooking some food. The performer(s) will have a much stronger (and likely harsher) opinion of their performance than their audience. So in a sense merely having that IQ, to an outside observer, is a determiner of success.