Yes, I also think that currently the players are not able to perform and play well according to the set that they are creating. If the players are lazy and irresponsible and spend their season playing badly in every match, then it is their failure. I do not see any reason for coaches to come and go here because if the players do not play well and if the players are not changed, then that will definitely happen. Ten Hag's first season was great, but later on, since his strategy did not work, he should have used other strategies but he did not. However, since there is a new coach now, he must try differently and form the players' sets well. It is not possible to continue in the way that Ten Hag failed, but the new coach must manage in a new way so that the team can play better games and their performance can return to its previous level.
I disagree with you because a coach can never fully strengthen a team. It is true that the coach has a lot of responsibility over the team and the players also have a lot of responsibility over the team. If a team depends entirely on the coach and does not perform well in the match then maybe that team is not strong. There are also many teams whose coaches are not very good but their players perform well on the field due to which they are able to win matches against their opponents. Ten Haag was the long-time coach of Manchester United after which he failed to improve the situation of the team. Now it is to be seen how the new coach of the Red Devils can make them stronger with guidance.