No one can argue that it was the correct decision really, from a footballing standpoint it made no sense.
However
Acun bought into a narrative that a lot of home fans shared. That we were slow and boring to watch. He is trying to move us away from playing a style of football that everyone is trying to do. Pep ball, have complete control of the game and hope your players can produce some magic in the final third. Form a new identity different from what a lot are doing, whether that pays off is still up in the air, but the game needs some differentiation now. Without the endless pits of money Man City have, I think that style will always fall short, especially at our level.