while everyone’s 401k’s are diversified (and people on this forum will fight you to death how brainwashed everyone is about this) people that make real money ab

while everyone’s 401k’s are diversified (and people on this forum will fight you to death how brainwashed everyone is about this) people that make real money absolutely do not diversify. I drank the diversification cool-aid for two decades and saw my portfolio generally hum 8-9%. then few years ago I moved all of my money into 4 stocks and my returns have been same as before with few extra zeros in front of 8-9