Why do you consider Vlahovic a flop? When they brought him from Fiorentina, he was seen as an idol and his form was at a high level. Even when the club started to "sink," he was still there and delivered good performances. Of course, he's not in the same form he once was. Then they brought in Kolo Muani, who also didn’t shine...I still think Dušan is a good player.
Vlahovic performed brilliantly with Fiorentina in the 2020 -21 and 2021- 22 seasons. He scored 38 goals and 6 assists in the two seasons in the Fiorentina jersey. And it was because of such excellent performances that Juventus bought vlahovic.
However , Vlahovic scored 43 goals in 4 seasons with Juventus. He could not shine in the kuventus jersey. But we cannot blame Vlahovic alone for this. In the last few seasons, we have seen Juventus playing in a completely defensive strategy. Because of such a match strategy of Juventus, they are not able to score much . Dusan vlahovic is a very talented player. If he was with any other squad , he would probably be able to score more.
In Italy there are many players that play very well for Fiorentina and Atalanta (I would say especially for these two teams) and when they move to a bigger team they find a lot of difficulties. Is it because of the pressure? Is it because they play in a different way? I don't know, maybe it's a mix of those things, but many players had mediocre performances after leaving Fiorentina and Atalanta.