If you ask an Everton fan, they will advise against Koeman. The Dutch team was also about to restart and Koeman managed to do that. I don't want to compare the national team and the club team now. For some reason, however, coaches from the Ajax / Bar?a school only have their great successes at these clubs. Was like that with Rijkaard, was like that with Lucho (although you can discuss the "school" there) and is like that with Koeman too. Successful with Ajax and Eindhoven, failed at Valencia (despite cup victory) and Everton. With Guardiola you can't speak of failure, but he's just a completely different caliber. With the resources available, despite great football away from Bar?a, he also failed to win the big "CL".
The recent past at Barca shows that the most successful coaches are those who have a great history as Blaugrana-players. At some point there comes a point when there is a conflict between the coach and the team and then the decisive factor is who emerges as the winner here. There are books about Pep's conflicts with some players. It is also known that the tablecloth between Lucho and Messi was cut 4 months before the triple and that Xavi and other players had to intervene. If it's the players who win such a conflict, then they do what they want. Valverde was popular because the players had complete freedom. Under Seti?n, his co crashed into some players because he was a tough guy with enthusiam and shouted at players from the sidelines. What happened? In the game after that he just sat quietly on the bench and has never been seen on the sidelines since then.
What do I mean by that? This team has huge egos, players who have really won everything there is to be won. I don't think Tata Martino, Valverde or Seti?n are bad coaches. They all had great ideas and promising inaugural press conferences. Sooner or later they all had to find out that this was not feasible and they bowed to the will of the team. In order to be able to train this team successfully, you have to have a certain alpha mentality. All who have successfully trained these players in the recent past have the following in common: Legendary status at Barca due to numerous successes as players. Accordingly, a certain self-confidence and respect from the players.
In the current situation, this team needs a "my way or highway" type. Koeman doesn't have to be popular, he has to have respect within the team and assert himself if there is a conflict. Because one thing is clear: he will have to make unpopular decisions. Busquets is used to playing every top game. Koeman will (hopefully) force Frenkie into his position. It means accepting or changing club. Creating turmoil because you have lost your regular place and feel offended must not be rewarded (see Vidal). And Busquets is just one example of a few more.