Hansi Flick likes to work systematically. He must have given the tactics that will bring this to the team. Also, the young players that Barcelona have can play without breaking the system because they have been playing in the team for a long time. For them, playing selfish football is in the background. They do not play with the excitement of youth, they think more professionally. This shows us that Barcelona can have a great squad in a few years. The problem for them in the future is not a striker to replace Lewandowski after he leaves.
Hansi Flick does have the ability to formulate strategies and most importantly he can use players to play more solidly because in reality young players are mostly much more egotistical and show their personal skills more than working well with the team. Teamwork also looks more solid because Barcelona players are much more concerned with winning than individual achievements in the match. Now we can see the ability of the young players they have and I am sure in the next few years they will be more mature. Lewandowski's replacement does need to be prepared and perhaps so far there is no choice available in the team because if you look at the abilities, there are not many pure strikers owned by Barcelona who have the same abilities as him.