But one possible way to look at this is as a regulation on what technology coaches can or cannot use currently as they please. E.g., defenses playing against teams who run no-huddle offenses usually have no time to call plays or change the defensive scheme, and thus allowing the defensive captain to update and change plays at the line could be a huge plus for teams that _wanted_ to do this but currently cannot.
Forcing coaches to use iPads on the sideline for the hell of it is silly; prohibiting teams who want to analyze film in realtime on the sideline or instantly communicate plays on the fly who wish to do so is a bit different.
Allowing such communication changes the tradeoffs of such a strategy. How are you concluding that one set of tradeoffs is "correct"?
But... must it? Why? Expand the "obvious" for me. Because I can't actually see why the game must keep up. And I can provide a good reason why it mustn't keep up, which is that we don't really want games won or lost on the quality of software that one side or the other has at game time. It's not the question we're interested in, it's not what we want to watch.
I italicized "the game" above because I am strictly talking about the game. Tech for safety gear or medical treatments? Bring it on. Mandate it. Go nuts. But who cares if the coach is calling plays from a tablet? What matters is a level playing field, not what level the playing field is on.