Not too many other places for the dish, though, I'd argue.
Of course, some ships apparently don't even have one!
Perhaps the Kelvin isn't supposed to be a mighty capital ship like the Enterprise, not having been one even back in her heyday. Weaker ships might rely on a large number of peashooters, much like destroyers of old had lots and lots of barrels for five-inchers or lighter guns when the first true battleships made do with as few as four heavy barrels.
Or it might represent a generation change, with the Kelvin being a strong capital ship armed by a maximum number of the best guns of her day in "late 19th century" fashion, but the Enterprise sporting a radically new weapon type that provides the same firepower with fewer, stronger mounts in early "20th century" style.
...I do hope the guns of the Enterprise will be different! And I sort of believe this was the whole point of this, a dramatic choice that helps tell the two ships apart.
Good explanation, and I agree. I just hope they're not ALL pea-shooters... just once I'd love to see some frightening sci-fi weaponry. But even if we don't get that, there's a lot more this movie potentially has to offer.