I'd be interested in why you say that. If you were looking for a new road bike, would you assemble a list of all the possibilities first, or would you narrow your search by eliminating some items?

Some problems on a bike can have dozens of possible causes, and randomly trying each one is just wasteful. In fact I have seen people do just that and end up "fixing" a click by replacing pedals or a bottom bracket when it may have been caused by insufficient tightening.