Darwinia is a strange combination of old-world and cargo cult. Original generations most likely gave up technology, and subsequent generations make the same decision for their descendants. But they also forget; each generation knows nothing of the magics and science of their elders.
Darwinia is a colony set out for one single purpose: Evolve a better human. However, unlike the Darwinists as a whole, they do not seek to visit the knife of evolution to others (arguably, as nobody asks the new generations). As well, they recognize and seek to avoid the mistake that many others have made when applying evolutionary pressures to tool-using species:
They guarantee a level technological playing feild.
The planet of Darwinia consists a series of regions (with many repeats), each of which is isolated from each other with some of the more advanced technologies of SA. Orbital facilities grow human populations in vitro before depositing them into these regions, en mass and uneducated. As the populations grow and learn, supervising pseudo-intelligences allow transit between similarly aged & advanced populations, monitoring the success of this or that genetic combination.
Struggle, survive, reproduce; that which does not kill you you have evolved past.