This is where my issue is too. I see particularly in Pedri, a player who has the ability to keep the ball really well when pressured....and that's it. What does he do with that skill?
Iniesta used to roam around his side of the pitch, providing support to players struggling to keep the ball due to him being able to keep the ball even in the tightest circumstances. This made it easy to retain possession, but also made it easy to do this in more dangerous areas of the pitch. He also used to be able to drive when presented, whilst also having a very exact through ball, which he used to provide additional penetration. So far, outside of moving the ball, I don't see any of the roles and duties Iniesta had.
In comparison to Xavi. Xavi also had this ability to keep the ball, but he also used his sharp first touch to open up angles for himself to make passes. Further to this, he always requested for the ball and was always trying to set the tempo of the game. He provided an additional link to the defence by coming deeper at times, but for the most part, where Iniesta acted as a responder, providing support to teammates struggling to keep possession; Xavi was taking the ball to ensure the flow of play. He also roamed, sometimes playing one-two's in order to get back control of the ball for a switch of play or with an eye to make a penetrative pass.
What I see from both Pedri and Gavi is them simply passing the ball with no real assignment. Gavi can at times provide more of a box to box presence with runs and defensive actions, which he does decently, but not at the level people make it out to be ( which is fair given his age). Pedri doesn't dictate a game, yet people act like when they see Barcelona having more possession than their opposition, Pedri in particular must be the heartbeat of that. Which isn't the case. I actually think Busquets has more of a claim to that, in a similar way to what Fernandinho and Rodri are doing for City. In fact, I'll go as far as saying the duo are actually Man City's 2019 midfield without David Silva or Bernardo Silva's dribbling action or occassional penetrative passes....meaning that they aren't the hub of the possession football. For Barca, Kounde, Alba, Busquets, Frenkie and Eric Garcia provide more passes that Pedri, who provides 51 per game. Gavi averages 29 passes per game. In contrast, Xavi was averaging 100+ passes per game, whilst Iniesta was averaging around 70 passes.
I'm not saying they have to be exact copies, but I really don't see exact roles either. You have people calling them better than a young Fabregas. People saying they are better than a creative dribbling attacking juggernaut in Musiala, a box to box force in Bellingham and the perfect destroyer with good technical skills in Tchouemeni. I'm not even including the likes of Foden here either.