Well the why change would be who else does it? I mean if even one successful pitcher advocated it and was able to substantiate it without velocity loss..perhaps at that point debatable..Sorta like the Marshall debate...until you see his mechanics in the majors and successful, it's an interesting discussion and thats all. As a coach do you know a college coach that would allow/recommend it? If the kid is in the velo range to go up..I'd consider it (Changing it), if he's not going beyond..what the heck let him enjoy it the best way he can.
The other than is velocity loss or failure to reach velocity potential.