This is like Amarna, a totally artificial city. How it is laid out will tell us a great deal about how the leaders thought about things. Which is always interesting.
Good analogy, this could have been rooted in Sargon II’s chosen favorite deity, as Ahketaten was.
OTOH, I wonder if it was partly about the general random growth of old capitals making it desirable to start again from scratch.
Walt Disney bought a big chunk of property when he started Disneyworld because the Anaheim original was so hemmed in.
The Akkadian era Assyrians had at least two capitals one of which was started from scratch (The Curse of Agade is an old poem about the last one). The more ancient kdm of Elam had Anshan, but at least one later capital. Persia had at least two.
Y’know, maybe the US needs a new one...