A and B squads are also a key element in any sport if you have enough players to divide into 2 squads all players benefit
and to me that is where sports fall apart. It is not enough to have the quantity of kids for an A and a B team. but you need to have the quality of A kids to make an A team.
In a sports like lacrosse you need at least 12 "A" players to make a legit A team. If you only have 6 A players that doesn't help anyone. in age groups of 4th grade and under you are foolish and misguided to break out A and B. As regular town PAl like teams. Travel you pay for your child to play. and you want them in the highest level they can play.
In travel Your child gets selected to a particular team (politics aside) If you don't believe the level your child gets selected for... you change the level by changing the team/organization and get to the level you believe your child belongs. If he doesn't play or is over their head you will know.
Breaking up the kids for the sake of having A and B teams misses the point. and if you don't get that you never will.