With just wood and rope they could probably accomplish amazing things. I'm convinced on a personal level that stone age people had cranes to lift boulders with.
There are certain bodies of human knowledge and practice which aren't usually referred to as "technologies", and I think that leads us to underestimate their complexity and importance.
In particular, I'm thinking of textiles and agriculture. It's no coincidence that both were prime targets of industrial mechanization, occupying a huge proportion of all human labor.
Not mentioned in TFA: cordage is a critical component in slings, an early, powerful ranged weapon.
With some sort of pulley, rope allows a single human to excert large amounts of force trough leverage, often in ways more convenient than other forms of mechanical leverage. (Such as actual levers.)
We tend to picture prehistoric technology as a progression of increasingly clever stone tools because stone is what survives, but rope may have been closer to infrastructure
Stone age peoples still existed until fairly recently in Africa and Australia, so stone age technology isn't prehistoric at all. What's prehistoric is stone age technology from other parts of the world.
In particular, I'm thinking of textiles and agriculture. It's no coincidence that both were prime targets of industrial mechanization, occupying a huge proportion of all human labor.
With some sort of pulley, rope allows a single human to excert large amounts of force trough leverage, often in ways more convenient than other forms of mechanical leverage. (Such as actual levers.)
Rope can also be used for 1:1 power transfer.