I kind of disagree with this implication. Images like post #410913 don't really make me think so much that she's a chibi, as she's just more of a kid.
One of the arguments that was also brought up about making the whole chibi_miku tag was that there supposedly is a growing amount of fanart as well. If there is fanart, there is no guarantee that the other artists have to depict Chibi Miku as an actual chibi.
