So, what you're saying is that an important part of making it to the pros is knowing when
not to act as a pro? Makes sense, a junior rider doesn't need to adhere to a strict training plan and diet, sometimes it's important to relax and have fun, go out with your friends and grab a few beers, eat that piece of cake, get really drunk and break your leg... (maybe not that last part.)
And it's not just the juniors (and U23s) is it? Established pros need a balance too. Imagine a guy - otherwise totally serious, and an important part of his team - telling his team management; "You know what? I can't do Almeria this year. It's the day of my daughter's school play." shouldn't that be allowed?
As for the Danes. Oh yeah! Back in 2012 Sebastian Lander won the national championship, and then quickly got a contract with BMC... well… been a while since we heard from him, hasn't it? Same year, the Danes were pretty… dominant at the Course de la Paix Juniors. Those guys? Well… you might recognize a few of the names.
https://www.procyclingstats.com/race/course-de-la-paix-junior/2012/gc/stages
What did they suddenly do right? I think an important part might have been advising riders when
not to accept a WT contract. Which, paradoxial as it might sound, might actually be a sign of confidence. Knowing that if you're good enough for the WT
now, you're probably also going to be good enough
next year. That's not to say it's always been a success; Magnus Bak Klaris, who won both Course de la Paix, and Paris-Roubaix Juniors back in 2014, has retired.