But the aboriginies didnt achieve much, say, compared to the probably very similar ice age europeans.
Their art, mere daubings which are uninterpretable. (European artists you stood a chance of recognising what animal they were attempting to depict, indeed such records are used by paelentologists to recontruct the animals. A lot of african cave art is also crude, but it tells a story also)
They didnt build much, nor did they have clothes (as opposed to the europeans who in their few self depictions were snappy dressers)
We dont know much about the european technology, but what little we have seen was well made (and of course, just because you have poor stone tools means nothing, possibly your stone is poor quality, or you concentrated in other areas)
The boomerang, that was impressive (but many societies had throwing sticks, Im not sure that the returning sort were unique to australia. The ancient egyptians had them, and interestingly, another application of the technology they had was to carve gliders in the form of birds.)
Their language? I know nothing on that, but they had a great many languages, and a certainly sophisticated mythology, so I have no doubt they would have had an impressive command of words. The Yaghan indians of Tierra del Fuego were another extreemly primitive group (probably more so than the aborigines) but their language was sophisticated in the extreeme.
They couldnt count, but they didnt need to. (actualy they could count, they had a binary system, 1, 2,1-2, 2-1, 1-1-2...it did not get them very far, its interesting to note the primitive societies that had very interesting (some would say cumbersome) counting systems. But then the Greeks and romans had the dratted roman numerals...)
You talk about them not changing anything, but thats not a human trait, that is an animals. We shouldnt judge them as animals, nor as museum pieces. (but their skills are worth learning, adaptabilty is a good human trait)