you don't need one

Hmm, so the Mac Pro is overpriced? If so, then the Macintosh II was overpriced. [Disclosure: I was the publisher and primary editor of The Macintosh II Report]. Indeed, we heard that exact same claim back in the late 80's about the Mac II (and the Mac Iix and Mac IIfx), and it went on to be a popular and useful tool for many. They were essentially state-of-the-art desktops that appealed to very high end clients. Most folk bought a Mac Plus, Mac SE, or Mac SE/30, though.