Even moreso than personal skill development, this is going to have an effect on the complexity of offenses and defense that teams run and that is something that college coaches take into consideration. The Iowa FC Coaches Association often has stated that they are committed to making Iowa HS football the best in the country. Being a member I hardly can think the leadership is happy with this decision.
I would have rather seen them put a weekly hourly limit on coach/player contact and let the coaches decide how to use that.
Also, IMO, a 3 hour practice is way too long. Kids cant stay focused that long, and most kids aren't in shape to be practicing that long. This will lead to more injuries than having 2 practices during the day. Really going to hurt the smaller 4A's that have a lot of guys going both ways as they are going to have to be very efficient with their practice time while Valley, Dowling, SEP, Johnston, and maybe the Ankenys have guys only practicing 1 way.