Just like one of the greatest inventions in the past few centuries was indoor plumbing, running water.
It is incredible a culture could be around that long and not figure out how to work metal, either. Complicated things, yes. But other cultures mastered tech in shorter spans. Just look what the Egyptians were doing 4,000 years ago.
This is all part of the liberal fetish to worship losers and victims rather than to respect winners and achievers. In the long run, this cannot turn out well for our society or culture if minds are prepared to be nothing but losers. We need warriors with hunger for victory, not loser pansies.