It’s the ego and myopia of never having had to go through any editorial critique with his videos. He was his own boss, and he thinks he’s making gold, so there is no room for improvement in his mind. It’s like Tommy Wiseau. He paid his own way, and was certain he had it right, and the result was The Room.
It’s common among artists that came up on their own. The histories of independent film and comics Are chock full of trash that 90% of people look at and say “Wow, how the hell did they think THAT was good enough to put out?"