Starship Polaris said:
The difference being that there's no 23rd century for the movie to be set in, any more than there's an historical Krypton for Kal-El to fall from.
Ergo, there's no more or less restriction on redesigning the fictional 23rd century than there has been in redesigning Krypton every few years since the beginning of "Superman" in the comics - and the reason to do so in both cases is simply to update the property to suit evolving tastes and expectations (as well as to let creative comic book and film artists be artists and designers rather than human photocopiers).
Hmmm... "human photocopiers"...
So why don't these artists and writers simply start with a completely clean sheet of paper, instead of capitalizing on the STAR TREK name?
If you want to see the 2008 Camaro and you don't have time for a 1970 Camaro, then there's nothing wrong with making a NEW TREK with new characters, no Starship Enterprise with "NCC-1701" on the hood, no Jim Kirk, no Spock, etc.