There's some calculation around that say you can't make usably-large habitats by plugging them in a tether and spinning them... so people almost universally decided that you can't make usably-large habitats that spin.
I guess that's the nature of internet arguments.
I'm interested in spin gravity but I've never heard of this before. Where can I find these calculations?
I don't remember where you can find it.
But that tether will have to lift the entire weight of your ship, plus a share of its own weight. The longer you make it, the heavier it will be, and you get a problem similar to a space elevator, and before you get to city-sized, it seems to require exotic materials already.
The choice of materials impose a maximum size for any design that rotates as a whole.