Agree with that. They had good idea about creating "reserve league" some 5-6 years ago (maybe more, I can't really remember as time flies around really quickly
) but then sadly they didn't execute that. I think it would be great to see Barca B playing every season against Castilla, Atletico B and other first division teams filials. Now our 18-19 yo kids have to play against 8 or 10 years older opponents in Segunda or Segunda B. Yes, they are probably more talented, but they don't have enough experience on that level and they are also physically inferior as they are still kids playing against grown up men. So most of them have to keep up with that physicality instead of focusing more on technical and tactical aspect of their game. Other teams can think different based on their playing style but for Barça youngsters I prefer good skillset and/or tactical awareness (depends on position) over pure physicality. But of course they should be able to run (kilometer matters
).