Rome was unusually superior to its rivals. Chinese, Indian and Persianate empires occurred again and again. Rome happened once and was never reassembled. Great big plains where you can grow lots of food are a much better foundation for an enduring empire than a sea where almost all of the connecting land masses has mountains nearby. I’m not aware of anything similar to the Punic Wars happening elsewhere until the Hundred Years’ War. That’s staggering levels of state and popular commitment to war, for a very long time.

Rome was in fact special.

There's always a winner in hindsight. Explaining why the winner won is easy, but predicting who will win is hard.

BTW, at the time, I think being on great big plains would have been worse. Sea transport was, what, 20x cheaper than land transport? Rome couldn't possibly have supported a million residents if it weren't on the sea and able to extract grain from across the Mediterranean.