I know Chelsea struggled in the just-concluded Premier League season, and their performance in their pre-season matches isn't enough reason to conclude that Chelsea can't finish in the top four of the Premier League table. In the past years, Manchester City did not performed well in their pre-season matches, but they always ended up winning the Premier League title. Chelsea is still a threat in the Premier League top-four race since we don't know how they will perform in the new Premier League season.
You shouldn't use Chelsea to compare Chelsea because there is a big difference in both clubs when it comes to performance and their coach. I would not blame anyone who is doubting Chelsea's performance next season because there is no prove yet that they are better than last season especially now that a new coach is in charge.
Chelsea have bought a lot of players in preparation for next season but it is still going to be difficult for them because it a new tactics that would be used and new young players would be mixed with the old ones. Some new players might find it difficult to blend into the team.
Interesting, so far I have not followed every development of Chelsea. but if I refer to their player list, most of them are young players. to be honest, I do not really know the style and system set by Enzo Maresca, so I can not speculate anything on Chelsea. at least, while waiting for their hunt in the summer transfer window. if I may be honest, I am not sure about the front line that Chelsea has. the question that interests me, which player will be the main choice by Maresca for his center forward. moreover, Chelsea has not brought in a stable striker who is a mainstay in terms of scoring goals. if it is Nicolas Jackson, I highly doubt it. but, he could be better under the guidance of their new coach. as for Osimhen, there has been no recent development between Chelsea and Napoli. for now, it seems like it will be quite a difficult challenge for Enzo Maresca to bring Chelsea much better. I mean, to finish in the top four of the Premier League. it does not mean they do not have a chance for that, but there are several points that are my reasons. however, this is just a temporary guess. after all, the competition has not started. We will find out soon after the transfer window closes, and the real campaign begins.