When it comes down to it, there isn't a ton of innovation coming out of the desktop on any platform lately. The focus in the industry is web and mobile, not on the traditional desktop ecosystem that underpins those two things.
If you include laptops as part of the "traditional desktop ecosystem" then there are lots of innovative 2-in-1s, detachables and convertibles, including the Lenovo Book (a laptop with no physical keyboard).
The "traditional desktop ecosystem" in the form of Windows has also added a lot of features from the mobile ecosystem including sandboxed apps maintained from an app store, notifications, and a voice-controlled AI (Cortana).
The mobile world has reached the stage where you have to look pretty closely to tell one high-end phone from any other high-end phone, and the tablet market is in steep decline. The PC market looks quite innovative in comparison.
Sometimes a half-assed effort is better than none.