Its the same as if you are terrified of heights, being a professional mountain climber is a very bad plan. You either need to get over it somehow quickly or choose a different career.
And there is nothing wrong with that. We all have unique strengths and weaknesses. Success comes from following our strengths not trying to plow through our weaknesses.
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"
To the extent he's making a point such as "I gained nothing from this experience" or that he's asking for advice or thoughts, I think some of the thoughts -- such as working toward your strengths rather than through your weaknesses -- are interesting.
Fast forward 15 years of not doing it and I'm terrified to go up on a roof.
My point is you may have an inclination to be afraid of something but don't let that limit you. You probably can face your fears and overcome.