experience is not an important thing as long as he can maintain cohesion team. There are many new coaches who are inexperienced out there but can win prestigious tournaments. Like example Pep guardiola who have new as coach barcelona senior at past, but he proved that he could and was even able to win the league with many achievements. Maybe now we need to wait first until the league starts, maybe there will be a surprise like what happened on new coach before.
Who are them beside Pep? I believe there are not many.
Pep is a gifted coach, he's an outliers, not an average coach. You should judge it based on the whole population, you will see a lot successful coach aren't successful with their first team, that's the reality.
Anyone can play football, but why only Ronaldo and Messi are popular?
Xabi Alonso can also, not just Pep so I think we can't underestimate him before there is proof.
It cannot be denied that Pep is a pretty good coach but that doesn't mean there aren't any great coaches like Pep in the world, I'm sure there will be many who will emerge and now it's visible is Xabi Alonso.
Players and coaches are different, that's what must be remembered.