RPSeawright makes a very compelling argument for reliance upon systematic models:
At the institutional level, making fewer decisions can mean building an investment process that, in effect, makes the decisions for us. If we carefully and collaboratively build, monitor and continue to evaluate a process that gets us to the decision we need without having to make (potentially a lot of) active preliminary decisions at every step we can improve outcomes, often by a great deal.
So if you want to make better decisions, start by working out how you can make fewer of them.
HT: Abnormal Returns