You are making some good points but the level of opposition the B teams in major leagues face will be much better than league 2 in scotland. They have much more money and therefore better coaching. Just adding B teams to the system doesnt mean it will work in scotland.
The leagues you mention have always produced some of the best players, B teams or not. One thing they have in common with scotland is the wipiing out of compeititve football. Bayern are on to 7 in a row, juve 9, psg 7, barca and madrid are nothing more than a more glampurous old firm as are porto and benfica. Ill stop here before i go off pn a tangent about how football is barely a sport nowadays
Not that there is any competition in scotland anyway but adding B teams will make.it worse
Im interested to see how the results of our performace schools, we are starting to see glimpses of this already,no end results yet but glimpses.