Other clubs lack that quality take a look at Arsenal when they needed to be serious, that's when they started losing games, which is very poor management at one point,
If you are a team manager and you do not have many quality players in your team to make team rotation easy, as you team plays more games and you keep using the same players, they will be exhausted, and their performance will drop which will affect the team's performance, that looks like Arsenal's problem last season, not that the manager has poor managerial skill.
I don't think the fire that Liverpool once had is there anymore.
Liverpool lost some key players last season and the new players who joined them did not immediately fit in. They will perform better this season.