To me, Man U and Chelsea could be arguably compared together, after all, they are rivals, and if you could remember, Man U was facing exactly the same thing Chelsea is facing now years ago and was able to move out of it in about a year ago while they still have a lot of work to do. Chelsea however is in the woods and coaching might not be the major issue now but moving in and out of players to almost completely change the narrative and the orientation/psychology of the dominant ones.
it's true that manchester united also fucked up last season and now Chelsea is also occupying the same shoes, manchester united own did not get worst compared to that Chelsea who narrowly escaped relegation, since they have gotten a new coach I just hope the presence of the new coach will improve the performance of the club, due to the fact that the coach will need time to identify the club's weaknesses and suggest improvements.
As for Lampard, I don't know why the guy would be ridiculing himself, his contract is only till the end of this season, it's too short for him to even breathe not to talk of making impacts. Lastly, it's not a rumour that Mauricio Pochettino is coming to Chelsea, the guy has signed 2 years contract already and will resume on the 1st of July.
The frequent changes in coaches have impacted the performance of the club, but strategies have been developed, and I hope the two-year contract will benefit the team and sign in good players. Lampard is lacking in some areas, but I believe with time he will improve. I'm also confident that Guardiola did not start out well in his career before becoming the best. I will keep saying that next season is going to be hot am sure of that.