YEAH, boarding schools are very beneficial for the all round development of the kid.
i know boarding schools too have some pitfalls, but nothing is perfect in this world.
but they are betther than normal schools in ways like:-
they work for the 360degree development of the kid.
they are best teachers of descipline.
teach to handle adverse situations with ease.
have a good scope for overall development as academics and sports being kept mandatory.
kids stay away from parents, so they learn to take decisions without parents, and dont have to hold parent's hand everytime for every decision.