Indeed, at the beginning of Ansu's appearance he was a player who had good talent, it's just that with the history of injuries he has actually become a dilemma where the performance with the glass foot that Ansu currently has is like a difficult situation for Barcelona to keep this player and I think his chance to change clubs (Sevilla is still trying to approach) is still wide open for Ansu next season.
Moreover, now Barcelona is coached by Hansi Flick, who really doesn't like players who are easily injured. Ansu Fati will clearly be denied a return to the Barcelona squad. For now and the future, Barcelona is preparing the ideal squad under Flick guidance because the demands are quite big, especially in La Liga to improve a slightly bad season. After what Flick is aiming for, Brighton only has 2 options to bring Ansu Fati back or extend him, even if he returns Ansu Fati will definitely be used as guarding the bench by Flick and that will only make Ansu Fati lose more playing time. His history of injuries hampered his career, at his young age it was a shame that it ended badly.
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Nothing team will accept a failed player like Ansu Fati, I mean Flick recognizes Barcelona current situation and doesn't want to make the team's condition worse making Ansu Fati Barcelona main player. It was initially rumored that this young player could be a reliable player but in fact his talent did not match what was expected and Barcelona would prefer to sell him and if Brighton had an interest in making an offer to Barcelona, the team would be happy to let him go.
There is no intention to demean these young players, but as we are discussing now, Barcelona needs the readiness of players who really have a high mentality to face the competition in the next season. If we remember, Madrid has threat with new players (Mbappe) for Barcelona.
Hansi Flick knows what he has to do and will take wise steps to prove that he is a reliable coach.