Several factors converged:StyrbjornSterki said:But that only raises the question of whether all the "piano" in the pre-blood vector doping era was a choice of convenience, or whether it was a necessity driven by the lack of EPO's recuperative magic.
1. Shorter stages and ASO adding incentives to get the pace moving early.
2. Testosterone, blood transfusions, and other recovery doping.
No less than Sean Kelly has talked about #1 during the early minutes of TdF stage broadcasts. He called it very different racing.