I agree with the final part, but if you are sensitive to framerates, you can't not notice it. I understand that a lot of people don't see these kinds of things and kind of envy them, but for us that do, it does detract from the experience. It's like there's two of every line and you can't focus anywhere, whenever something moves.
And the worst part is that there's really no reason why it's limited to 30 fps. The Vita should be capable of running this in its sleep.
Everything being equal, in what way could it possibly benefit from a lower framerate?
If you are sensitive to 30 fps games, it must have been hell going through every game generation since Pong up till now.