What is clear is that Xavi is at Barcelona in the wrong conditions. When Barcelona's financial situation was in ruins, Xavi came in and tried to improve it little by little. In my opinion, Barcelona should be grateful because in his first season Xavi presented the La Liga trophy in the midst of a bad financial situation. But this time Xavi couldn't hold back anymore when he didn't get full support. I also can't blame Barcelona officials because it is difficult for them to take other options when there is no adequate financial support. However, if you look at Barcelona's performance after Xavi's decision to leave it has improved a little, in terms of play it can still be promising. Moreover, at UCL the potential is quite large if they succeed in conquering PSG.
I agree with you that Xavi was in Barcelona at the wrong time, which in the end made him burdened by circumstances that were not friendly to him. I really appreciate what Xavi has shown with Barcelona since his arrival, he was even able to win the LA Liga title last season in a difficult situation for Barcelona. Finance is one of the supporting factors for a club, where if their financial condition is not good, it will affect the team's overall performance, but Xavi can cover this even though it is not that perfect.
You are also right that management is also in a difficult situation, but I prefer to blame them for what they are experiencing now. Regarding the demands and pressure they put on Xavi, it should not have happened so that Xavi felt disrespected. Because they also have to realize that they cannot provide everything that Xavi needs so far, even to bring in new players they have to consider it carefully and they are also looking for options where they only recruit players for free.