Its not the prosthetic, its the shape of the ears that is important. You cant make the point in the middle of the upper lobe, it has to be towards the rear...stuff like that. You cant have red plasma, it has to be blue. You cant have the status lights on the main viewing screen on the Bridge going across the top, it has to be the bottom. These things have become part of Trek canon (for whatever reason) and Paramount had kept them all very very consistent with the help of fans. It does not help your case that Roddenberry himself was also a stickler for these things. He created the canon and the details.
The new Trek is trampling on lots more than the timeline. Red matter? How is it that a single drop of the shit sucked Vulcan into a black hole, but a whole ship of the stuff was only enough to draw Nero's ship in and was thwarted by a few tiny warp cores exploding? Why did the original black hole jump Nero (and Future Spock) into the past, but the second one destroyed his ship? How did Scotty get his hands on a Tribble when they had not been seen until the Enterprise encountered Harry Mudd? How was Vulcan visible from Delta Vega when Vulcan has no moons? These are not trivial things.
There is lots of stuff that comes to mind which are cringeworthy in the 2009 Trek movie. The beer factory engine room juxtaposed with the Apple Bridge for instance. The freakin STICK SHIFT to engage warp drive. Seriously?
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