I think you are missing the point. Figuring out how good you are at a skill is only 1/2 of the story. There is also value is finding out if you think you are

I think you are missing the point. Figuring out how good you are at a skill is only 1/2 of the story. There is also value is finding out if you think you are good at it, or if you know that you suck. A good programmer should know what they don't know, and not be arrogant.