Instead of manipulating the URL it would replace it, and instead of each site doing it their way it would be handled by the browser in the browser UI. Sites can implement their own back button too, doesn't mean that's where it belongs.
Think about how Powershell use objects instead of text to chain together commands. The address isn't just text, it's structured data, why not treat it as such and make it more useful?
Think about how Powershell use objects instead of text to chain together commands. The address isn't just text, it's structured data, why not treat it as such and make it more useful?