Kulusevski had multiple good games for Juve, pal. Especially at the start of his stint with us. But he couldn't bring it consistently and eventually spiralled downwards.
If it's not clear by now to some people, it's a team problem and not a coach problem, it never will. The same discussion was made last year when I was defending Pirlo (who obviously made mistakes like Allegri has now).
@Post Ironic was on the other side then if I'm not mistaken. The big picture here should be; keep a coach until there's an actual complementary squad in place and judge them then.
- - - Updated - - -
One might prefer a coach who famously subbed in Arthur once over.... one with experience as a head coach, who has gone through rough patches at some topclubs and coached through them, maybe one who has one multiple scudetti and Coppa Italia's and gone to CL finals all while being known for his flexibility and working with the squad at hand.