Most people are their own worst enemy in investing. True or false?

Starting with 0 at 25 if you DCA 1K a month to 65 you will end up with $8.6M. Heck you can even DCA until 45 and never contribute again and you will still end up with $8.3M. Assuming 11% annual gains. I believe in investing most people are their own worst enemy. The rolodex of choices like options, margins, leverage, covered calls, cash secured puts, CFDs, complex rebalancing, chasing the next hot stock, finding the next NVDA, the list goes on, all this are mostly rooted in greed, you want to beat the market and optimise for a few more percentage points, or just plain gamble for a big win.