I like Bogleheads and their philosophy, but I do worry about the risks of advertising doing things on autopilot.
If index funds become big enough the equilibrium for active traders shifts from trying to own great companies to trying to game the index fund algorithm. Investors have to pay at least a little attention to the market to make sure that they are still sane.
Part of the funds' expenses (thus the expense ratio) are investment in techniques/technologies to avoid getting fleeced by hedge funds as they rebalance.
If index funds become big enough the equilibrium for active traders shifts from trying to own great companies to trying to game the index fund algorithm. Investors have to pay at least a little attention to the market to make sure that they are still sane.