Point is that there are players that amount to something elsewhere.
No club will ever deliver a Messi, a Neymar, a Verratti, a Haaland etc every other year. Barcelona never did.
Thiago, Angelino, Grimaldo, Rafinha, Morey, Olmo, Garcia, etc etc is very well - all these players have played in the KO stages of europeans cups if I'm not mistaken - most of them not for Barcelona but for other clubs...
La masia works well and brings talent still, but Barcelona A has relied too much on bringing mediocre players with big names from elsewhere since 2010. Most of the homegrown players would have it easier to succeed in a system that they were already developed for.