Excuse my French, but fuck Dieter Rams. I certainly understand this viewpoint, and I have no problem with folks that adhere to it, but my problem is with stating as some sort of axiom, with no evidence or reason, that "Products fulfilling a purpose are neither decorative objects nor works of art."
Humans have built things that are both functional and beautiful since culture first existed, and there is nothing wrong with designing products with a strong visual aesthetic viewpoint. If we all followed Dieter Rams' silly advice, all of our computers would still be boring beige boxes, maybe covered in stickers "for the user's self-expression."
Note I say this while agreeing with the latter part of your post. I'm not a fan of this particular design - it feels kitschy and shallow in the same way that Hollywood "hacker" movies show terminals that look like 3D game worlds. But that's just my personal opinion, and I don't fault people for feeling the exact opposite. I do fault people for saying that you shouldn't be allowed to try, and if you do that you are "not following principles of good design."