As a cyclist (albeit never raced), I want to get offended by this but I feel is largely correct. There is a lot of real time strategizing happening in road races however the marginal gains of simply having more Watts per kg for more hours trumps everything else.
Bicycles are the most efficient form of transport... at moderate speeds. At elite level speeds you are so far down the exponental well of wind resistance that you need meticulous attention to aero savings and sustained power output. All of the possible aero gains permitted under the rules are already accounted for. That leaves power output as the only avenue for gaining a competitive advantage. No other sport has the same combination of antagonizing factors at play.