yes, in fact, challenging a coach before letting him start is crazy, I still remember when as soon as Pirlo arrived they immediately started to challenge him and this is not good because then it puts the club and all the players in crisis, and yet then Pirlo turned out to be a winner with a scudetto and an Italian cup and in any case he was sacked, being a coach at Juventus can't be easy, that's for sure!
The club wants to get a trophy, whatever happens they have to be able to get the trophy. So, it is natural for the club to put targets and pressure on the Juventus coach so that they can win. After all, they are a big club with a history of winning lots of Serie A trophies. So it is normal that pressure is put on the coach, even though his status is a new coach
(doesn't have expierience coached Juventus before) at the club.