While I don't endorse this particular theory, considering that something like a gotshall block or a fizzbuzz is proof of a certain skillset, it is certainly possible the corner balls being cones is not a comparable proof of work
Still doesn't make sense to me. Those programming tasks have to be a certain way because they have a very specific use outside of the testing. If that's what you imply, then we're none the wiser, still having left unexplained what that use might be.
In the masterproof example, the purpose of the sphered joint is whether the maker can draw and round every sphere while not compromising the rest of the shape. It is not the end shape that is important, it is how the craftsperson is able to execute it
