A lot of talk about holdbacks so I reached out to USA Lacrosse to see what their take was. My take on the response (below) is that they agree with the opponents of holdbacks but have no power to actually do anything about it. In other words this is an issue with the Clubs and leagues and the funny thing about that is to play club we are required to join USA Lacrosse.
Thanks for reaching out to USA Lacrosse. USAL has best practices for play segmentation based on age not grade, we ask our member leagues and sanctioned tournaments to abide by these guidelines developed in concert with our Sports Science and Safety Committee. However we do not govern all events or tournaments in the country. Unlike other sports like soccer and hockey, membership is not required to play.
We continue to work on this issue and educating tournament and club operators on safety standards around age segmentation for safety reasons. | 
