I think the Chelsea owner should be patient with the managers, if he believes that developing the players is simple, why can't he choose to train the players himself? Chelsea has the Premier League youngest squad and wants to win every trophy. If I am not wrong, I don't believe Chelsea has any players above the age of 30 in their current squad, they are only signing young players, and the management expects them to win trophies. In my opinion, this is why Manchester United did not fire Ten Hag, they are afraid of having a bad season like Chelsea.
However, despite how badly Manchester United performed last season but did not fire their coach, management is still pushing to offer Ten Hag a long term contract because they believe he will bring good outcomes to the club. Chelsea management must be patient with their managers, if you believe that the coaches they fired did not produce positive results for the club, I disagree because we saw how Pochettino turned things around at the end of last season, but Todd Boehly believes he is not capable of managing the club.
Chelsea owner should give around two season for new manager Enzo Maresca before sacking him such as did for Pochettino just giving one season only, its require how develop one team always need progress and time around one or two season later before sacking them as head coach position.
Chelsea dominance with many young players for next season after huge rotation did by Chelsea owner sell many senior players and replacing by young players haven't experienced for playing in Premier League as huge pressure competition.
Difference with Manchester United management have more patience waiting for with Erik ten Hag progress, have been second season and last season failure bring United to the top fourth standings but his position keep secure and the management extend his contract for next season. Chelsea's management must learned more with Manchester United management or Arsenal keep their manager more than two season improve the performance.