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Apart from very little patience, Chelsea management made a big mistake when appointing Pochettino as Tuchel replacement, they should have seen the situation that occurred at that time from a positive angle. Pochettino is not an accomplished coach, he was often fired due to his inability to handle the club according to management's expectations. When clubs often change coaches, the players have to adapt again to the tactics and strategies used by the new coach. The club will also be greatly disadvantaged by having to pay compensation from the remainder of the coach's contract.
You are wrong, Pochettino did not come to replace Tuchel at Chelsea but he came to replace Lampard who was then appointed as Chelsea coach for the second time. Tuchel's dismissal was certainly not the right decision, while Chelsea appointed Graham Potter to replace him. Pochettino's appointment as coach was not a mistake, but Chelsea just couldn't wait to give him a longer chance to improve the team, that was also a mistake that Chelsea should not have made on Pochettino.
Enzo Maresca who has just received the trust of Chelsea management, must be able to make Chelsea appear consistent. Management has high hopes for him because he is amazed by the achievements he has just made with Leicester City. His first season in charge of Chelsea may not go as desired because the level of competition in the EPL is very competitive. Management must be patient with Enzo's work because the success or failure of a coach is seen when he enters his second season managing the club.
Since Chelsea fired Tuchel, they have been handled by 5 different coaches, including the latest being Enzo Maresca. Graham Potter made 31 match, Bruno Saltor 1 match, Lampard 11 matches and Pochettino 51 matches. Pochettino is certainly better than some of the previous coaches, but he didn't get more opportunities mainly because Chelsea wanted to sack him and replace him with Enzo Maresca.