Ah, but tabbed browsing would presumably screw that up. Say I wanted to look at the "Big ladies with their big boobies"* thread, but was embarrassed to be seen doing so, I could Apple+click on that, and then quickly click on "A very sensible guide to using a Mac" as a incredibly clever and devious front, and as I had most recently clicked on the sensible thread it would be displayed.
*This thread doesn't exist, before you all start searching. <giggles at the idea of looking at "Who's Online" and seeing 900 "Searching Forums"> 😛