The article has a link to a previous Gruber article that mentions things falling to the ground because of "gravity" as an analogy for asking about seemingly basic questions about "why things happen".

It's an article that inadvertently confuses readers with too many layers of indirection and requires reading another article to get the prerequisite "Insider Baseball" knowledge to connect all the metaphors together.

So... asking "why not Intel stickers on MacBooks?" ... analogous to asking about gravity. And "too many confusing options on GUIs" ... lines of code to enable extra options has a gravity.