To be fair their society looked pretty close to perfect right before the Fall begun. They could do whatever they wanted, could literally move stars around to meet their whims, terraformed planets with ease, had the ability to essentially build planets (craftworlds), and knew that a pleasant afterlife awaited them after they eventually died, and if they really didn't want to die they could use soulstones instead.
Also we don't know how much they lost tech wise. They may still have the ability to move stars around and terraform planets but now doing so would be pointless. We do know they lost some major artifacts but we don't know which, how important they were, or how many.