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The pressure will always be on the coach's side when the club asks the coach to win the title every season, this request cannot always be fulfilled by coaches in the modern football era. The increasingly fierce competition makes it more and more difficult for coaches to meet club management's expectations, coaches will be considered a failure when they are unable to present a trophy at the end of the season.
Zidane once felt how difficult it was to coach Real Madrid, even though he had won many prestigious titles, he was able to break the record for winning the Champions League three times in a row. When he failed to meet management's expectations the following season he was immediately deemed a failure and the club immediately looked for another coach. Ancelotti cannot give a guarantee of being able to present a prestigious trophy every season, ups and downs in a club's performance always happen every season. Accepting an offer from Brazil was the best decision for Ancelotti, especially since so far he has won almost all trophies at club level, maybe it's time for him to win a trophy at international level.
Your comments represent what I want to say, but that is only possible for a team that has the ambition to win titles every season. Barcelona and Real Madrid are two La Liga teams that often fire their coaches when at the end of the season the coach doesn't bring the expected title, but several other teams like Atletico Madrid don't do it that often.
The rivalry between Barcelona and Real Madrid has always been the reason why these two teams continue to hope to be the best in history. So it might make sense for Ancelotti to accept the Brazilian offer if he feels he is no longer capable of make prestigious titles to Real Madrid next season.