User blog comment:Trulyrandom/Are Fanon Septs NCF?/@comment-3258762-20130813135127/@comment-3258762-20130813175213

Yes but the galaxy is quite litterally an immense place. Doubling the Tau Empire would barely even take up a portion of the western part of the galaxy (which really tells to how huge the Imperium is)

The Tau do not have the same problem with canon-ity as the 2nd founding chapters do, they are not fighting an enemy that would be horrendously underpowered should the Tau Empire swell.

Not to mention, considering how making a Tau Sept is pretty much the only way to make a fanon Tau faction other than an Enclave, we kind of have to make that sacrifise if we are to ensure we do not single out a specific fandom.