Chelsea's last season's poor performance was because of so many factors. They wasted close to $600m on the wrong players. The new owners thought that buying new players will give them the result they desired. Without proper planning they went on a buying spree, getting any player not considering the piece tag. They also got an averagely experienced coach Graham Potter to manage a club that was far bigger than his capacity. Selection became a problem and many key players like Mason Mount were left out of the first team. The club's performance began to dwindle and there was disaffection between the players, management, and coach.
But it seems the club has learned from its mistakes and is willing to make amends. The signing of Mauricio Pochettino is a step in the right direction. And he has helped to restructure the team by allowing many players that are not part of his plan to leave not minding how much they have cost the club. New players have been bought and their performance in the preseason has been encouraging. For the first time in a long while, we have seen Chelsea playing offensive football and getting some good goals.
I think "lets put money in the club so we win" is normally a good strategy and that's why they tried it. I am not saying that it is a 100% working strategy, and we have seen it with them that it's not, so it really did made some sense in that regard. However, when you think about it, you will realize that you are not going to really get anything different on the long run.
We should be considering this situation as a bit different, and that should make it happen one way or another. We have seen psg, bayern, city, real, all be richer than most other clubs so why not make Chelsea the same way as well? That was the idea at least but of course it didn't work out. Hopefully they will do better this season and look like they really did learn their lesson for sure.