(3) the players play w/o the use of videos...often the video will see a receiver open
that the QB doesn't;
(4) the coaches coach w/o the use of computers calculating the success rate of a
potential play;
While I am not advocating replay at the HS level (or any level), these two statements are no longer true.
QB throws an INT. He comes to the sideline, is handed an iPad, and immediately sees the play that just happened. Seeing who was open, and now, more importantly, who was not.
Coaches keep scouting reports on those same iPads, or on computers in the press box. They are consulted throughout the game regarding play selection, tendencies, etc.
For better or worse, electronics are now a part of the game.