All good points.. For fans of other sports and for semi initiated into bike racing few can understand why there would not be defined measurements.. Like World cups, playoffs or Championships.. Currently a person winning the world championship is less than the rider winning the TDF and races and racers are less if their schedule puts a greater weight value on Giro or Vuelta instead of the TDF..the obvious answer is to allow Giro timeframe to stay around the same despite problems with late snow conditions and slightly adjust TDF and Visits for increase in between races, add title and significant financial incentives to compete in all three..
Pogacar for example looks like he could contest Vuelta w 3-4 weeks in between the two major events. Bike racing would be doing itself a long term benefit to have a long term easy to follow points series like F1 , GP1 or NFL..in my opinion