Mediocre software pervades the industry because mediocre developers are the ones writing the blog posts that get shared around. Mediocre developers are the ones who are so loud in defending their choices (and criticizing others for not making the same choices) because when you don't completely understand something, the way to win is to be the loudest. Mediocre developers do RDD, Resume Driven Development. And businesses don't help the matter because they don't know that a talented developer can come up to speed on any tech that they're using reasonably quickly so they often hire the RDD developers to "fill a need".
