Ok, then accept this as the price to pay, that's an option too.
Use this teenagers as good for the moment and if they get struggle to injuries because they are forced loan them to some other team like Fati.
The solution may be better squad management and astute signing policy. Not to throw in the towel for 5 years and roll over.
If Pedri, or Gavi (or Lamine) are playing it is because despite there age they are good enough. But then they don't need to play every minute like Pedri under Koeman or Gavi last season where he was below par.
Gavi going down with this injury is going to produce alot of strawman theories. Maybe him playing too much causes it, or maybe it didn't. Maybe it was his playing style which was causation.
Look in our B team at Angel Alarcon. He went down with long term injuries and he isn't even part of the first team setup. But if he was you would probably cite the fault being us relying on kids.
Also if we look at Ansu he also went down for almost a year during his stage in La Masia. So the re-occurance of his injury problems may likewise not be because of being a first team member either.
But yeah, if we play young players alot they may get hurt. I agree with that. The same goes if we play 30 plus players alot they may get hurt. Or if we play centrebacks on the wing they may get hurt. Or if we play Dembele at all, he may get hurt.