Elon Musk's hubris has come back to bite him -- and Tesla (NASDAQ: TSLA) shareholders -- yet again.Less than three months ago, Musk devoted a substantial part of Tesla's Q4 earnings call to talk about plans for massive automation of the vehicle manufacturing process. (This plan flew in the face of decades of industry experience and management theory.) Musk even said that Tesla's factory and production process, rather than its brand or vehicle designs, would be its long-term competitive advantage.It didn't take long for reality to set in.