Chaosking
So basically first and second heaven are 3rd world countries but the powerful people among these third world countries get leftover and recycled tech no one uses and 3rd heaven and on is modern world. Though that kind of raises the question of why all-seer doesn't know about things like skyscrapers and modern architecture, do they just have high tech but everything else is just like 1000s of years ago?
Bro if you want realism read non fiction also it’s been stated that humans are a relatively new race in the four heavens, and the thing about humans is we adapt to what’s available. The thing about anything that’s created (technology or even art) is that it’s a product of need and circumstance, with however many of different technologically advanced races there are, each of their tech would be different and humans certainly wouldn’t start from the ground up we’d simply adapt their tech to our needs. Also even if things look similar doesn’t mean it doesn’t entail new knowledge like All-Seer says.
FunnyBuns:Bruh you are actually trying to tell me in all these millions of technologically advanced realms and races involved there isn't one with such a design? Be realistic.