Chelsea is actually very good at recruiting star players, Chelsea's only fault is in the coaches and club management who like to change coaches. not a useless player, but a Chelsea coach who can't maximize the potential of players. It's like what you mentioned Aubameyang and Kai havertz who said they were useless for Chelsea. Look at the goals that have resulted in titles in the past... See also Mohammed Salah and KDB being thrown out of Chelsea, what will become of KDB now at Man city?
What if Tuchel hadn't been sacked maybe the situation wouldn't be like it is today, while Potter and Lampard didn't match the expectations that the club management wanted, on the other hand the recruitment of many Chelsea players in the previous season also spent a lot of money and even more spending from Chelsea than the team Another EPL, so indeed this problem must be solved immediately so that the Chelsea club is not at the bottom of the standings anymore.
After seeing how bad Chelsea's management was, not only when selecting players but also hiring a coach, you could say it was careless and you didn't think about how much bigger Chelsea was than hiring an incompetent coach. Until now, everyone has been confused by the Chelsea owner himself who often makes insignificant decisions, spends big money, buys unknown players and now the big responsibility has been placed on Pochettino. So there's nothing to see of any growth because Pochettino needs a long time. Therefore, like it or not, when Chelsea is required to develop significantly, the impact will be Pochettino who will be the target of fans.