Yeah Barbolini managed the team badly, especially Naz-Groblena as starters, and he created bad environment/energy in the team.
However, let’s not pretend that Galatasaray managment aren’t the biggest clowns in Turkish league
they give statments about how they are creating stacked squad next season, huge investements, “star” players (their words), etc.. hyping fanbase so hard only for them to create squad that we all knew would need to fight hard to even enter playoffs. The result is that their fans are angry on social media 24/7 and result is nowhere so the club makes all kinds of weird choices during mid season and nothing comes out of that again.
Then the cycle continues with another promise of investemnt and huge huge transfers for next season, fans get hyped and.. well, you know the rest.