The 1T-SRAM and EDRAM framebuffer caches in the Gamecube were also much more interesting on a technical level. Considering how poorly Aqua ran on the Mac's of that era, the Gamecube's 3D hardware probably would have been better suited to OS X than Apple's own.
It's a far superior design imo.
How many people ran Photoshop or did desktop publishing on a GameCube?
It's all software, some of it just costs more.
The “cheese-grater” Power Mac G5/Mac Pro had handles. Which are great on a 42-pound chunk of aluminum…except they had sharp edges, and you sure felt that.
(I hauled my 2006 Mac Pro between 3 different apartments. I remember.)
May be even a Wireless Charger on Top so you could charge your future mouse, Apple Watch and iPhone on it.