Anyway, Barca put themselves in this situation and since time, they've already made things horrible with Messi still there. From coaches, to purchases, to internal power struggles. So it's not a mistery that they do have to ask even more from their younsgters nowadays. Let's hope Yamal survives.
At the same time, maybe not that much in Europe, but in SA it's pretty normal for players to start at a very young age, since always and lately too due to loosing players even in the youth ranks and agencies buying them at 12 years old, many times it's the only path to play very young fellas.
Even in the past, in more stable times regarding financial aspects, a Pele, Maradona or even an Aguero would start very young. And even if not in Yamal's numbers, they are not that far from those and in the Geniuses cases, with an over the top rough treatment.
The thing for instance these three examples had on favour, it's their build, they had massive legs since a very young age and that helps a lot.
Even if it's not a certainty, it's mostly very talented players with a more slim, less bulky structure the ones that would suffer more in those first stages the roughness on every sense of pro football. At least Yamal doesn't have the dribbling atributes, attitude and tendencies, so he can take care better of himself than the ones mentioned that were constantly hacked.