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Why do Chelsea managers do that because they certainly have their own analysis of why they want to change faster it could be that there is nothing suitable that the Chelsea owner wants while we know all that needs a process but Chelsea owners have money they can change whatever they want.
Chelsea now has a new manager Maresca I hope he is the one who can make changes where Chelsea will not play badly anymore but never expect this too quickly there is a long process sometimes the owner is always impatient as he said, next season we can see a new face for Chelsea.
It is not an easy task at all to change a team's inconsistent performance in a season. New coaches need adaptation, the same goes for Chelsea bringing in new players. Chelsea could improve gradually and this is clearly more likely than expecting them to win the title straight away next season.
It requires good cooperation between players and coaches both in a game and in the dressing room. Basically, Chelsea has good players in their squad, but sometimes their performance is like players who are not motivated to win. I had that impression in many of Chelsea's games last season, but I hope they can improve next season too. What is certain is that not only Chelsea, but I also hope that Manchester United can also improve better.