Juventus' weak point was Allegri's terrible defensive tactics that suited no one in the team, and they had absolutely no build-up play whatsoever. Juventus traditionally has strong defenders, but they were always able to supplement that with quality midfielders who knew and had the freedom to play football. That wasn't the case under Allegri. Chiesa is a left winger and good as a second striker. When healthy and under the leadership of a good coach, he can contribute with around 10-12 goals a season and around double-digit assists. Looks like we won't witness what could have happened under Motta.
Every coach has a different match strategy. Allegri played a bit of a defensive strategy. Juventus' overall performance was stable with Allegri's help. But such a performance makes it much more difficult to dominate Serie A and win the Serie A title. Juventus scored just 54 goals last season. On the other hand, Serie A champions Inter Milan scored 89 goals. 35 goals less than Inter Milan. And with attacking players performing so poorly, winning the title in a competitive league like Serie A is not possible. Serie A's renowned and richest club is Juventus. They will definitely want to be Serie A champions. But with Allegri's help, they failed to dominate Serie A.
Juventus have changed their coach. I'm not sure if Juventus can win the title with Thiago Motta. But I think we will see a change in Juventus' overall gameplay next season. Motta is likely to strengthen Juventus' squad. And next season will play completely attacking strategy. If Motta succeeds, maybe Juventus will regain their lost glory within the next 2/3 seasons.