Sorry, I should have been more clear. My answer to @WorthBeast96788 was referring to the real world and not the game. And I wasn’t referring to value judgments either, his caveats at the end imply that he understands that (which is precisely why I ask why anyone would call him a racist).
In the real world, there is no way to objectively measure an organization style as advanced/primitive among different peoples, since each people had its own way of measuring. Like, what if the Aboriginal style of organization was what best suited their needs? Or even if they could change, but preferred that one because it was pleasant to them? Not every people in history wanted to found an empire.
(WALL TEXT ALERT)
A historical example using technologies: Portugal shared a lot of knowledge with Kongo in their initial friendship. Some things Kongo adopted, some didn’t suit their needs and some they didn’t want. The plow and masonry are good examples of common techs in Europe that didn’t happen in Kongo. Due to the disease, there were no draft animals, so the plow was impractical. In addition, some observers claimed that the Kongo people harvested a lot without much effort, with just a small hoe (possibly no-till, better suited to certain tropical soils), and knowing that they could maintain a high population and a professional army, the hoe should work very well. As for masonry, Kongo kings tried to spread it starting with the royal palace. But the native ideas of impermanent housing + the inadequacy of the masonry for the environment (the palace itself was exchanged for a big earthen house later), limited it to the churches in the end.
So, in the end, each people adapts in their own way with technologies and ideas that they think are best for themselves. Based on this, is one technology really more advanced/primitive than the other, even if it fulfills the same objective? Were Aztec chinampas, another example, more advanced/primitive than other agricultural technologies in the world?
Tl;dr: given how little we know about the aboriginal people compared to others, there is no way to say their situation, let alone judge whether their technologies and other achievements were advanced or primitive (of course, unless we use a foreign and consequently biased metric).
Now, when it comes to the game, yes, the aboriginal people don’t fit the aoe2 model and so no one has ever seriously considered adding them.