These are all actually good advice. Even "Avoid fields for communication between methods" although there are enough cases where it's better than the proposed alternative: when you have the method's implementation split into 10 private methods that need to pass 4-5 different pieces of data (for a total of 10-15 pieces) between each other, it's easier to just invent a private Context object, shove the data into its fields, attach those methods to it, and implement the public method as "return = new Context(...).doWork();".
