My thought is that with all the high-profile busts in the early 2010s, the guys somehow got cleanish or didn't go too extreme.
With the British UCI presidency and eventually the WADA presidency, the guys were kept on a very short leash while Sky was allowed to do all sorts of dirty things that helped them win races with less talented British riders.
Something similar has happened in athletics, where the British government has installed its man as IAAF president to ensure that "British interests are protected".
What later turned out to be in the British interest was that Paula Radcliffe's blood should not be tested again, and that the mediocre British long distance runner Mo Farah should not be busted after which he magically became a world-beater approaching his thirties.
With the French UCI presidency, other teams have probably been emboldened and have also started to move into or across grey areas. Which led to Sky/INEOS slowly losing its advantage.... and again, I'm not saying Pog or any of them are clean these days, just the situation is not as extreme as many people try to make it out to be.
This theory may not be correct, but then I would like to hear people's explanation about Froome. How is it possible that a talentless rider at the age of 26 with zero wins and never even close to winning has improved so much overnight that he enters the GT GOAT conversation? While his opponents are all moving backwards in performance..
As for the quality or scouting of talent in the current era. Just look at the 4 most successful GT drivers at the moment:
- 19yo Pogacar rides for a small Slovenian CT team, do you think 30 years ago the next step for him would have been to ride for the richest team in cycling? Of course not, and it would probably never have reached its full potential.
- Vingegaard in his early 20's in the modest Danish CT team, do you think 30 years ago one of the most successful teams would have discovered that with help and professionalism this guy could have a lot?
- Remco did a completely different sport to cycling until he was 17.
- Roglic is even more incredible how he became a cyclist...
30 years ago maybe none of these 4 guys would have been professional cyclists.