Without conflict-of-interest fees like 12b-1 fees and revenue sharing, the world becomes a lot simpler for 401k plan sponsors and a lot safer for plan participants.
The politics of envy, fiduciary irony and “Investment choices? We don’t need no stink’ investment choices!”
Just because something is measurable doesn’t mean it’s relevant.
It’s not the operating costs, it’s the shareholder fees. They’ll get you every time.