route is duplicated between individual pages and path/definition?

[zacaj]

Looking at different routers and wanted to give tanstack a try, but I'm very confused from the docs and examples about how routes seems to duplicate the actual path.

If I use file based routing, then the path inherently exists based on the path to the route file, or if I use virtual file routes, then it's defined by the route config.

But at the same time, it seems like both these are only allowed to point at a 'route' file, which inside of it contains a call like createFileRoute("/path/sub/route-a"), which... contains that same exact path? What's the point of having it in both places?

Weirder, I found createRoute, which I assumed would be more generic and allow me to not specify the file path, but it actually seems to require a path, while the path in createFileRoute is optional? Seems backwards...

the createFileRoute docs say that the path is required despite being optional, but that it'll be automatically generated, but I was able to create a test case where I don't pass any path and it works fine ?

Is using createFileRoute without providing a path, especially with virtual routes, going to break something, or are the docs just a bit misleading?
Alternately, is there a way to only use the paths passed to createFileRoute, freeing me to organize my files how I want and not have to manually build a virtual route hierarchy somewhere? (preferably one that will also work with tanstack start SSR...)