South San Francisco, CA, USA - May 1, 2022: A new Rivian R1T truck is seen at a Rivian service ... More center in South San Francisco, California. Rivian Automotive, Inc. is an electric vehicle automaker.gettyAfter a weekend marked by Warren Buffett officially announcing his departure from Berkshire Hathaway, investors are reminded of the importance of disciplined, fundamentals-based investing. Now, perhaps more than ever, investors need to be diligent in an increasingly speculative market.This week’s Dange ...