Oh don't we know. Another "special" feature includes having a multi-million gold piece economy all operating for the benefit of a few people.
It boils down to this is a different game. It also boils down to the same fact that monsters/npcs are built differently than PCs.
The assumptions are something that you may not like.
History is riddled with species that have examples of being special, and not forming another species entirely.
Are you saying that by having 1 PC (or even a handfull of them) kobold in the world that is different is somehow unbelieveable? I think the opposite.
Maybe having darkvision is one of the reasons WHY they are not with the other Kobolds. It doesn't matter. Or it just could be an oversight or mistake in the original entry that is not fixed. Is a kobold with a 20 or 22 strength a problem? it is outside their racial abilities after all.
The fact is that there are not PCs walking around in the default assumption of the game. PC Kobolds, Minotaurs, or whatever non default race you would like are even a lot less.
If you want to change the default assumptions, feel free. It is, after all, a Role Palying Game, and one of the staples is that your game is different than mine, on some kind of scale.
Now the Character Builder, to me is a fail by having 2 Minotaur races that PCs can take. The one from the MM should be replaced in favor of the other one. In fact, I like that things get updated on a regular basis with the application. That way, we can apply the fixes evenly.
