I disagree, Pogba had some very good seasons at Juve (even remember him picking up an award when Juve reached the CL finals). I know it's easy to hype up youngsters these days but Pogba really backed up his talents with quality performances. He'd not have been so highly appreciated if his reputation was mostly based on talent.
You just have to read Chillieni's comment to see how highly rated he was by his teammates :
"Last year we had a player like Pogba in midfield, who is the LeBron James, the Usain Bolt of football," Chiellini told Sky Italia.
"Last season Paul allowed us to play a certain way, but now he's not here and we made some changes. [Massimiliano] Allegri is working on finding a solution, we aren't idiots or clowns."
Mbappe had 1 single season at the top level, not even comparable IMO