I've begun to think the ancestors or potential ancestors built those amazing structures just to show off for their distant descendants. It worked. :^)
:^) That works as well, for me, as the current analysis: meager hunter-gatherers worked for 2000 years to build Göbekli Tepe... with no written language, no drafting materials, no engineering skills. Color me skeptical.
Of course there were those ancient aliens, also, coaching their ancestors. !:^0