Chelsea winning trophies will not come as soon as many have expected. Pochettino is building Chelsea from scratch with new players. Much shouldn't be expected from him. It will take years before we can see Chelsea comfortably lift a trophy. The least we can expect them to do at this season and the upcoming season is to fall between the top position of 3rd to 7th position of the premier league table.
Yep, it is not the right time to expect Chelsea competing for the trophy. I'm sure people only expect Chelsea to return to the top 5 of EPL standings. But, it looks like quite difficult for Chelsea because their squad isn't ready to compete with other teams which have more established squad. It is true that Chelsea has many new players, they need time to adapt with many things. We actually must understand if they are still difficult to give good performance, the new players won't suddenly play with their best only in few matches. However, TBH I'm also a bit surprising that Chelsea could be defeated by West Ham and Nottm Forest. Even if Chelsea dominated by many new players, their squad is much better than those teams.
Pochettino looks like he will fail to build a new era for Chelsea, he only marked its revival with transfer market movements, not with match results. If we wait longer, I'm not sure Pochettino will last more than two seasons at Chelsea. It could be that if the Blues suffer another defeat in the EPL, then he will leave sooner before seeing the players he recruits develop well.
I think if Chelsea loses to a club like Liverpool or Man City it still makes sense, because they are fellow big clubs. However, losing to Nottingham Forest clearly disappointed all fans, I think.