For example Arsenal, they will also be very busy maintaining their position in the Premier League. Manchester United are busy trying to get into the top 4. Juventus are busy trying to stay in the top 4 and all the teams competing in the Europa League have other competitions that are just as busy. So it's not only about Barcelona.
you are right The teams competing for the title in the Europa League this season are all looking to do well in their respective leagues. Barcelona and Arsenal are aiming for the league title. On the other hand, Juventus and Manchester United continue to fight for Champions League qualification. So the Europa League is probably the second priority for all the teams. And so it cannot be said for sure how the teams will perform in the Europa League.
Now it is assumed that the Europa League is not too prioritized for big clubs, it seems that this season is a little different because of the pressure that is on the Europa League by looking at the clubs that are currently contestants, it is clear that it will definitely be exciting and of course it will bring in quite a lot of money.
Especially for Arteta, Xavi or Ten Hag this can be proof because the club they are currently training needs proof with trophies, especially for Barcelona and Arsenal who have spent quite a lot of money in player transfers.
The main goal of the big clubs is their league title and the Champions League. But this season is a little different. Many big clubs are now performing in Europe leagues. But still the main sign of every team is its own league title. Barcelona and Arsenal will be looking to secure their league title. And then they will want to win the Europa League title. But as a common spectator we would definitely like to enjoy a competitive league.