Namespaces image is misleading

Hey there, I'm a socket.io newb, so forgive me if I'm off here. I believe the image at the top of the namespaces section is a bit misleading. It looks like it is saying the client can can connect to 1 or more namespaces on a single connection but that they are somehow logically separated at some point. This stackoverflow article suggests otherwise.
My understanding, the namespace is in the url of the connection and cannot be changed once the connection is established. If the answer in the article is correct, it should be clarified in the docs. But also, I'd like to understand what the uses of that are? Is it basically just a built-in mechanism to have multiple socket io "servers" in a single process?

Start with the image and text at the top of the namespaces section, then compare their explanation with the linked Stack Overflow discussion and the repository's current namespace documentation. Verify how namespaces share connections and what their intended use is. Done means the image and accompanying text accurately explain the connection model and use cases.