I don't understand this comment and the other similar ones acting like they are somehow adding insight... yes, he couldn't make it as an independent developer, that is literally the point of the essay.
Repeating the reasons he lays out in the essay and saying "yeah, you won't succeed as an independent developer" seems a little like hearing someone at Alcoholics Anonymous tell their story and then responding, "Yeah, it sounds like you can't have a healthy relationship with alcohol"