How does a machine have insight?

The human mind has insight.

My camera meter does not. All a meter tells me is the correct f/stop and shutter speed to use to make a white wall 18% gray, or a black wall 18% gray, or anything 18% gray.

I assure you the college students I teach haven't a clue what 18% gray is or how a meter works until I teach them how to use their mind to interpret the results.

Please explain what is accuracy in art?

If you didn't regularly buy out-of-date magazines, you'd have the money for test strips! Grin.