It's not even so much that the reasoning has been explained, but that essentially all the comments about it all (agreeing, disagreeing, etc.) have already been made multiple times in multiple threads about the same thing, where essentially nothing new was already coming up in those threads for some time, and basically won't come up here.
I hear you. That part doesn't really bother me though. Message boards aren't really any different than any other medium for discusssion. You probably hear the exact same discussions rehashed over and over again at the office, out with friends, at relatives houses, etc. Sometimes you get a fresh point of view, but usually it's just the same discussion.
Now, if its facts, like an answer to a question that has to keep getting restated (like why Apple can't warranty against water damage), I can understand the frustration there.