YOu make it sound like people knowing about design differences is a bad thing? Given the Camera was one of the big selling points of the iPad 2, and thus the microphone is important also for use with Facetime, then it is a bit of a big deal even if the difference proves to be somewhat negligible in real world use.
Of the expected
40,000,000 to be sold, most likely
39,999,000 will have no issues with it.
That's 0.000025 %
I hope the 1,000 who do have an issue with it include MacRumors complainers. If not, it would raise the "failure" rate considerably.