You're assuming that the futuristic-looking stuff is inherently "better" than the jungle setting. There's no particular reason for it to be, especially in a magical setting where the difference in the two may be mostly aesthetic rather than comfort or even function.

Tuliyollal is central on the continent and is their traditional culture.

Solution Nine at its most mundane interpretation is a city built to fit into an otherwise gloomy and inhospitable region in the far northwest reaches of the continent. Nothing we've seen so far presents a specifically compelling reason for people to move there.