Yes I also have that thought, predicting the junior team is much more difficult than predicting the senior team, and I think we already know that. Experience may be one of the factors why we see a lot like that, when they were young most players were still in passionate feelings, instead I saw that passionate enthusiasm if it couldn't be controlled properly it would have an impact on their quality on the field. It's different from the senior team who already have a lot of experience, and they can already be tested in terms of mentality, so it really influences the game and teamwork.
For junior teams, usually tournamentnets like this will be used as a way to show off their skills to talent scouts so that they will have the opportunity to make their football career shine even more, because of those who play in this tournament maybe only a few percent have played at senior clubs, like in In the English national team, there are Curtis Jones and Harvey Elliot who have played quite often for the Liverpool senior squad
And I was quite curious which of the teams playing were actually the favourites, and it turned out that they weren't much different from the senior team because from first to fifth place there were Spain, France, England, Germany and Italy, and then maybe we can use that benchmark even though favorite team will not always win.

Yes, that often happens in competitions at a junior age, that is their first step to be eyed by big clubs to start an even better career. The players are well aware that they will definitely be closely monitored by talent scout agents who have big names, and this is indeed an opportunity for them to show their abilities so they can play and join big clubs, especially those in Europe of course.
Not a few graduates from junior age competitions can become players who have big names in the future with their hard work and abilities.