They obviously were so capable and I have no idea. Maybe “being around” isn’t the end game or even what it means to “be around” is not a robust description of maximally being.
Discussion
The best explanation that I heard was basically that the second coming of Jesus already happened and we're living in Satan's little season. All the inexplicable civilations are basically divine beings doing divine being things. Then God smited them for some reason and now we're here
Its on the best because there's like no other explanations I've heard