Winning one of the most prestigious leagues is an obligation that must be obtained for a football team that has enough good player strength, because with that victory, they will get additional money from sponsors or investors so they can add to the money assets they have and continue growing to add strength to their team.
It's such a shame for a big club that never won a prestigious trophy. That means if the such team was wasting so many resources for nothing. The prestigious trophies can be considered as the top achievements that can be got by the club. La liga trophy has become the only prestigious trophy that can be taken by barcelona. That's why xavi is having faith in some players like pedri to help the club to secure la liga. That's very sad to see that gavi will not able to play in la liga anymore due to the regulation. Real madrid is still having a chance and it's not actually losing against barcelona. There are around 10 matches to come. As long as barcelona will able to lose three matches and real madrid may be able to change the situation.
Since barcelona is only focusing on la liga and I'm sure all of players will always perform so well in any match. Barcelona needs money from winning la liga. It's caused by the financial condition that faced by the team was limiting the movement of club to get the new players for upcoming season.
Some players need to be sold in the summer transfer season to give the ability for barcelont to buy new players again.