It's a very simple experiment: Create a set of intelligence-only tasks with answers that can be easily graded for correctness, then instruct one or more humans with an IQ of about 100 to do the tasks, then compare the performance to that of frontier AI on the same tasks.

We should care because "John's aunt" might rely on her paycheck as a professional painter to pay her bills. Many average humans have average jobs, some of which require intelligence (or creative production) only. Ignoring this reality is folly.