But I expected way more from a guy who was hyped as the next Xavi (even by Xavi himself, if I remember correctly).
Xavi hypes all good La Masia midfielders. Last time around in 2015 he also said great things about Samper, while also praising Xavi Simons and Riqui Puig. Although I doubt he himself called Samper the next Xavi. That would be ridiculous.
Also, I get your logic, but I still think it isn't fair to only expect La Masia players to be XI players. I believe La Masia is our foundation, not the icing on the cake. And btw, our best players have normally not been those who have been extremely hyped. Cruyff pushed for Pep, Xavi was disliked by the fans at the start, Valdes was really shaky in his first years, Pique got no minutes in Utd, Pep pushed for Busi, nobody expected Pedro to beat the likes of Assulin and co. (there were many good wingers around at the time in B and JuvA), Puyol was promoted at 21 after being told for years that he was never going to make it, Alba was rated not good enough in La Masia, and we all know Roberto's story (yes, he's the 5th CM and 2nd DM, but also the 1st RB as we speak, so he should start the UCL final if we get there
). The only ones who were extremely hyped from the youth categories who became vital world class XI players for us were Iniesta and Messi.
My point is that those La Masia players who succeed at Barça are often those who have the full support of the coach, both mentally and when the minutes on the pitch is distributed. With the amount of support by Pep, Bojan would've too, had he not had a very unstable mentality. Imagine if Pep was Barça's coach and Samper had been promoted back in 2015 after he showed great development at Barça B even though they relegated, instead of wasting a year in a crappy division with crappy teammates? Or had he just been loaned out to a La Liga club that would've fit him? I can assure you that you'd probably have thought of him differently than now.
That's what has happened with Roberto. Not trusted, almost left for Stoke, then Lucho saw an opening at RB and Roberto took it. Now he has the full support (even if a new RB is signed, I think), and he's on his way to become such a player that you expect will help win the trophies. Rafinha was well on his way too, before his injury that ruined an entire season.
Anyways, yes, my line is longer with La Masia players, that's my bias, but I don't think anyone, no matter how much talent, will make it at a club if he is never given a proper chance by the coach. It almost happened with Iniesta under Rijkaard, too.