@Di4na A very thoughtful piece, another factor I think that is often downplayed is the role of talent - the author of this piece is clearly very talented, but the number of people with enough talent in the world to work on highly complicated software like this is limited, so that adds YET ANOTHER filter on the number of people who can end up working on these things.
I think society as a whole tends to like to act as if anybody if they only want it hard enough could do these things whereas the reality is only a small fraction could.