Cycling is super interesting because of the science that has gone into it. Nutrition on the bike being one that comes to mind. Some riders eat like 140mg of sugar per hour. That is insane to me. The ubiquity of power meters has changed the game as well. I think they are one of the main reasons why we see younger racers winning grand tours more frequently. Back in the day you'd have to pace yourself through RPE. If you have never done a 21 day stage race before the odds of getting your pacing right is low. Now you can just read your power meter (for the most part).