All you've done is give me an orthodox timeline explanation for the most recent period of environmental stability. I understand that narrative and I think as far as it goes for how humans go from small numbers to big numbers and organise themselves is pretty much bang on. I disagree with the starting premise that all that went on before 9,000ish BC is flint axes and twatting mammoths. Especially when the planet was going through massive environmental changes at a point in history that Plato dated.
One thing any and every civilisation needs is a stable environment. When that environment becomes destabilised, that civilisation is threatened. If the destabilisation involves a comet leaving an 18 mile crater in Greenland and remnants of itself across 4 continents, a large part of an ice sheet a mile thick and covering North America being vaporised, causing tidal waves 600 foot high travelling at 60 miles an hour causing richter scale 10 earthquakes and grinding the bedrock away, that civiisation is probably going to find itself overwhelmed.
However, even though the period we know as the younger dryass had huge climate changes that wrought devastation across the planet, it was preceded by a period of environmental stability that lasted from roughly 110,000 BC to 10,000 BC. I just think that if we have managed to go from mammoth hunters to moon walkers in roughly 10,000 years of environmental stability then humans in the past easily developed some form of technology if they had 100,000 years of environmental stability.
Personally, I think my narrative of Gobleki Tepi being a memorial provides a good reason for it's construction and also for it's burial. I think the fact it is located in the foothills of the mountains where survivors of a great flood are told to have landed are relevant as I think it was these survivors that built it. That's why they knew the skills of quarrying and sculpture, as well as some engineering principles to get curved blocks to stand balanced, because they carried those skills with them. I'd also say that's why it continued for centuries; the first lot would be really close to the day of destruction so would be ****ting it about going any lower in the land and would quite happily stay a bit higher. As generations pass, the actuality dilutes into story, then myth, then into what the **** are we building all these stone circles for on some windswept foothills when the good land of the fertile crescent waits beneath us.