> There exist funds which have annualized a two-sigma return over SPY for over 20 years
the problem is that _many_ funds have positive returns until, suddenly, they don't. It's basically as hard to pick a fund or money manager for the long run as it is to pick a stock.
Consider Neil Woodford[0], he beat the market for over twenty years and was considered the best investor in Britain. Then started a new set of funds, which went terribly. It'd have been reasonable to let him manage your money, but it would still not have worked out.