It seems as though there's much less incentive for an individual with a rack full of legacy entertainment equipment to purchase an all-in-one device.
Specifically regarding the visual cues we see in the design - the box is literally breaking the plane of whatever it's placed on; the cube sinks into or emerges from what's below it.
The aesthetics of the product seem to indicate that it's aimed at an audience who doesn't own a collection of hardware it wouldn't "fit in" with; for these folks it might function as a centerpiece, rather than a tumor in a homogenized amalgamation of units.