Is something fun to see how Juventus was a super team without spending so much money and bringing so much high profile players for free because most of them ended his contract with another team, and now when they spend a lot of money in the transfermarket they cant be that good, is incredible.
Juventus were able to achieve that because there was no club in the Serie A league that could rival Juventus for the Scudetto at that time, and any quality players that want to play in the Serie A league always want to play for Juventus, which even makes it more difficult for other teams to rival Juventus for the Scudetto. Juventus is finding it difficult to win the Scudetto or even finish in a good position in the Serie A league table after spending a lot of money to sign players because a lot of teams in the Serie A league have improved their squads, which has created more competition in the Serie A league, and since Juventus's squad is below their rivals squads, they haven't been able to win the Scudetto for a few years now.
Things are different now, as several teams have developed and improved their teams. It must also be acknowledged that Serie A competition has become much fiercer, making it difficult for Juventus to compete and win titles like they once did.
Honestly, I'm still skeptical about Juventus next season, as they haven't built their team or made any significant changes, so their performance likely won't be significantly different.