I just saw the movie yesterday and haven't read every post in this thread thoroughly, so please forgive me if I'm re-hashing points that others have already made.
Rank, time in grade and time in service happen for a reason.
(snip)
No rank of officer has the ability to promote someone more than two steps in grade. To move four steps in grade would take an act of congress.
In our service, in our era. Other services have worked differently.
In the era of professionally-led armies and navies (as opposed to feudal, aristocracy-led), what services have awarded O-6 level commands to entry-level officers? I think the only examples you will find will be in battle when every intervening senior officer has been eliminated. And the arrangement does not become permanent afterward.
The historic trend has definitely been toward
longer service and experience before command, not shorter. If we made an educated guess, it would be that commanding a starship in the TOS time frame would take at least as much service experience as warship command does today, that is usually 15-20 years. With more technology, science, and alien cultural relations to learn, plus the factor of longer lifespans, the starship career path could easily be longer.
But what if someone is a natural, a genius, a
wunderkind? Think about it in other professions: Why shouldn't a brilliant medical graduate be made head of surgery at a hospital? Why shouldn't a young shortstop phenom be made manager of a major league team? Why shouldn't a over-achieving 22-year old foreign service school grad be put in charge of a diplomatic mission?
The answer, of course, is that nothing can substitute for experience, and the stakes are too high. Put yourself in the shoes of an admiral. You have, on the one hand, an obviously super-able, talented kid, just out of school, who pulled off a brilliant, heroic action. On the other hand, you have a captain or senior commander, who has paid his dues, worked through the ranks, held different responsible positions, managed smaller commands and accumulated a record of sterling service. Who do you entrust with billions worth of vessel and hundreds of lives? Realistically, now, what responsible boss would answer "the kid"? One brilliant action doesn't guarantee future performance. Neither does a two-decade career, of course, but what odds would you play?
Kirk's promotions in the movie imply that commanding a starship is much simpler than commanding a warship IRL today, that a talented prodigy can do it, no big deal. It implies that a few years of classroom and simulator training, plus one important and action-packed mission, is enough to reach one of the pinnacles of the profession. Whereas today, an officer spends the better part of two decades serving in assignments such as division officer at sea, a ship's department head, staff duty ashore, staff duty at sea, several years in various graduate schools, training or instructor positions, joint assignments working with other services, and a cruise as XO at sea.
Being a warship commander is one of the most responsibility-laden jobs in the world today, has been since national navies were instituted, and apparently is still in TOS's time ("not one man in a million" can command a starship, TOS "Court Martial"). Are we really supposed to believe that being a major Starfleet unit CO requires so little in the way of practical learning and experience? I just can't buy it.
A whole other issue is the effect that kind of promoting would have on the rest of the officer corps. That has been tried in the real world, too, and experience has been overwhelmingly against using promotion as a reward for valor, heroism or outstanding service. It's much more effective and efficient to develop a system of awards and decorations.
I'm not going to call the promotions a deal-breaker for the movie, but they definitely knocked it down a few pegs in my estimation.
--Justin