i didn't give a high school coach any more power. i stated a fact that college coaches and high school coaches have a personal relationship. and given this fact, college coaches probably know and respect a high school coach's wishes.
it isn't limiting anyone's opportunities. the opportunities will be there if the opportunities are there to begin with.
as far as the math teacher limiting when a student can visit colleges, i wont even entertain the ridiculous notion of it beyond the adults in any child's life needs to have his or her best interests in their actions, that includes every coach and/or teacher.