They can look like that and have low IQ but they were extreme pioneers for their time, inventing ways to create and harvest crops and even controlled fire for soil fertilization and other purposes.
The same goes for ancient african tribes still existing today that are also among the oldest still existing civilizations on earth, they are isolated genetically and still look like ancient humans from tens and tens of thousand of years ago, and still practice very ancient rituals and go after extremely dangerous wild animals by themselves with nothing more than hand-made tools. That's alpha as fuck, they take on Lions and shit with their hand-made tools, spears and such, most people would not dare to by more than 1km close to them being armed with firearms.
Honestly, I think that is amazing how much contrast there is the world, from people living in mega ultra modern technoligcal cities, to villages, old style medieval cities to people still living in extremely ancient conditions and customs preserving their history and civilization bloodline for tens of thousands of years.