I think that the Aubameyang deal is beneficial for each side. Because Chelsea immediately needed to sign a striker before the end of the window. Otherwise a very tough season was waiting for them due to scoring problems. Aubameyang is one of the great choices available in the market. He is very familiar with the Premier League too so there wouldn't be any adaptation issue as well. Barcelona needed to get rid of some players to solve their registration problems in the La Liga also. Depay or Aubameyang was needed to leave and they reached their goal.
Agree with what you say because in this case all have their respective advantages.
Chelsea are currently in poor form in their attack and with the arrival of Auba it is now hoped they will improve. For Barcelona, they were lucky because they got money and Alonso for Aubameyang, who was brought in with free agents.
For Aubameyang himself this is another opportunity because he is aware that Barcelona is now very difficult to compete in attack after Lewandowski arrived.