Chelsea should be able to put trust in every coach they employ, like Ten Hag at Manchester United and Arsenal with Artata. Not all coaches are able to do a great job in just one first season, even if it is not impossible, it will be really difficult because of the adaptation process.
Chelsea is completely different from other elite EPL club. They're strict when it comes to their managers and not welcoming any relenting outcomes. Erik Ten Hag in Chelsea? He would have been sacked long time ago. The previous owner, Abramovic doesn't welcome any relenting efforts or if he sensed any form of incompetence from the headcoach, he will definitely make good use of the sack letter.
If we think that Pochettino can lead Chelsea to finish in a better place than last season, he will immediately be fired, especially if we compare him with Erik Ten Hag, of course they already did in the first season. Each club has its own stance on handling this matter and Chelsea is known to be quite serious about their coach's problems.
I think Chelsea is really targeting results beyond their capabilities so any coach will think twice before deciding whether to handle a team that is still in the transition process. Apart from that, Enzo Maresca certainly wants to take this job considering that his name will also become more popular if he can manage Chelsea and compared to other experienced coaches, they are definitely reluctant to take this job.