Their "prosperous kingdoms" didn't have written language or the wheel. There wasn't that much pre-existing structure to destroy.
The soil is so volatile that wheels end up being dragged in the dirt, hence camels. It would have been cool if they had invented primitive AT STs though!
That is a myth that the colonizers were very happy to bolster, for obvious reasons.
"Don't even bother with the user "newnewnew"" - Ignore and ostracise those with opposing views. How open minded of you.
They had perhaps some authority structures, some nation and ethnicity based borders, perhaps less civil war type conflicts. At least that was taken away. Whether it would have been better for British and others to stay away is hard to say.