And if we're using that metric, it's extremely unlikely your average team member knows his or her ass from their elbow, either.
I agree with your second point, which is why I am a senior member of an architecture team in a company with 80 developers. It's our job to make sure ass and elbow confusion doesn't compromise the product.
And if we're using that metric, it's extremely unlikely your average team member knows his or her ass from their elbow, either.