> Some claim that index funds such as vanguard are also not guaranteed to continue being a safe bet once everybody and their dog switches to them vs managed fu

> Some claim that index funds such as vanguard are also not guaranteed to continue being a safe bet once everybody and their dog switches to them vs managed funds Managed versus index funds works not unlike the 50% rule of bitcoin; If managed funds / individual stocks start regularly performing better, money will flow into them (overpricing) and fees will rise so that index funds are underpriced. There are no guarantees in future performance; and your index fund is also not diversified from macro economy risk.