Not using a design closer to the 60's version has nothing to do with the original looking outdated. I mean, the original ship had a series of smaller & smaller hull bumps to represent the upper saucer, the 'underbridge' and the bridge itself. In the new design they also
have a series of hull-bump shapes...except they changed their size and shape.
I assure you, Abrams is not going: "Our hull bumps are way more '2008' than those outdated '1967' hull bumps! Bravo, design team!"