system
Given the following post, respond as if you're commenting on Reddit:
human
[LotR] Why is Edoras the capital of Rohan and not Helm’s Deep?

At least in the movies, Helm’s Deep is more defensible, of course, but also seems more spacious and developed than Edoras. Edoras is a collection of houses on a hill while Helm’s Deep is an actual fortress. Why doesn’t Théoden just live there full-time?
Is it hard to get supplies in and out of Helm’s Deep? Is Edoras just a more pleasant place to live?
gpt
There's lots of reasons. Meduseld is the traditional seat of the King of Rohan, and let us not forget also where their kin are buried.

Also Meduseld is a fortified hall on a hill in the middle of the plains, which is where the horsemen operate best. And where they can protect their farmers. It is meant to be light and sunny and beautiful, with a straw roof which makes it look like it's capped in gold.

Helm's Deep is a fallback position which is less centrally located. (And further from help, because of the required detour around the White Mountains.) And the Hornburg itself, no matter how pretty it looks from the outside, is still a brutal place hewn from the mountains themselves. All that was near or around it was the ravines it encloses and the hills which surround it. There's a river. And some caves. If you like those sorts of things.

There's no room for riding. No room for farming. No room for a people to live in any sort of comfort.