Because the structure of a space is flat, and you need, and should have, unique names for objects within it.
Oh, and Atlassian have worked with places where you ask things like "show me the definitive page about penguins" and the response is
Which one of those three is the definitive one?
👋 Hi there, a few of us at Atlassian would love to learn about how you use "space settings" functionality in Confluence. A facelift to the space settings is long overdue and we want to start with im...
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