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.

yep, there are indeed a number of players who are now quite worth watching and monitoring, especially for talent scouts.
There are several names that can indeed be used as one of the reasons to watch these young players. Apart from the names you mentioned, I don't think we can rule out Moukoko from Germany, who has become the mainstay of Dortmund or Ryan Gravenberch, who is now being touted as the future striker from Bayern.
Besides that, there is a new name that intrigues me for England, namely Levi Colwill, who must show that he is still capable for a big club in the EPL later.
Although indeed for the conditions of this championship it is a little complicated because indeed there will definitely be differences even though as you said the favorite team is always from a country that is big enough in football in the end.