The problem with the Chelsea club even when the coach has a long term plan for the team to be victorious in the future, you’ll just see the President sacking the coach after just one season flop and that’s not how to built a strong team. You need to have a transitional structure before you can achieve that and if you don’t follow it duly, you’ll cause the team not to rise amongst others in many years to come.
Chelsea’s poor performance have been on for more than two seasons now since the sack of Thomas Tuchel, all the coaches that came after him really did their best but Pochettino was the best man for the job but was sacked just after a season. Now they’re back to square one and need to start building the team again. I hope the same fate of Pochttino don’t happen to Enzo Maresca by end of the season.
There is no emotion in business, a contract is a contract and it will be valid as long as the both parties agreed from the initial plans. You never can tell if Pochettino had an agreement that he was going to put Chelsea in the top 4 or perhaps win the team a Premier League but all I have mentioned, they couldn't did any. You might not really see this in coaches reaction probably because they think the contract might annul and give them another chance.
Sometimes board decision I guess and you can't blame them, invested all you have in a club that used to be many favorite but then became a shit place where al teams can penetrate and break record without them making any progress. This is why I think changes subsequently comes to Chelsea team from players to Coaches.