Yeah, I agree with you that Chelsea still needs a process to build a solid squad besides that it takes the right manager to do it, Chelsea actually started to find their game towards the end of the season and Chelsea managed to climb to 6th position in the standings chasing Manchester United and Newcastle but unfortunately these positive results did not make the club owner change his decision to look for a new coach.
This process must be carried out because if you wait then Chelsea will not be able to compete with several other strong teams. Forget last season and let the new coach carry out his duties as a coach and hopefully get support from the fans so that the coach can make big changes for Chelsea. Chelsea is not experiencing financial problems so it will make it easier for them to find the players they need, they just need to change the pattern of recruiting players so that they are more appropriate to what is needed.
Last season they spent a lot of money to recruit players but in my opinion it was not optimal because the price of the players recruited was too expensive but their individual playing form was far from expectations. The new coach's job is to try his best and try to make his players more consistent in facing the competition next season.