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Pep Guardiola has made his name as a coach who has a brilliant history as a coach at Barcelona and also as a former Barcelona player. He has contributed many trophies to Barcelona during his time as coach there. So it is impossible for him to dare to return there because it would potentially ruin his own good record there. Because being a coach at a club that has financial problems is not an easy thing. Only a handful of coaches are able to bring a club that is in financial trouble but can still win a championship trophy. And actually Xavi is also a good coach. But we know that even Xavi has to hold back to be able to get good players. Even the condition of Barcelona's front line is not good enough after Lewandowski aged and was no longer productive. So Barcelona could only borrow a player from Atletico Madrid, namely Felix, to cover this problem. And yes this is not an easy thing for a coach.
As a coach who has had great success like Pep Guardiola, it is unlikely that he will return to Barcelona if this team is not supported by good financial support. Barcelona has big problems as a team that has history in La Liga and Europe, but they have been hit because their finances have not improved. Of course they are struggling to solve the problem and several approaches have been taken, but still they cannot solve it as quickly as expected.
Xavi arrived in the midst of Barcelona's dire financial condition and he fought and did everything he could. He was successful in his second season, especially by winning two titles, but Xavi was under pressure to maintain his team's performance in the third season. This season, many people want him out, but it feels unfair to fire the coach who has brought Barcelona's performance to where it is today.