The android ones proved, that no one (in Spolsky meaning of "no one") gets such a device and uses it in both modes.

I had one of them, Asus Transformer, and used it as a tablet only, despite having a keyboard which served as an additional battery. It was both, worse laptop than real laptop and worse tablet than real tablet. So why purchase it at all, when you are going to use it in single mode? There are better choices on the market.

I too have one and used it with keyboard and touchscreen. And occasionally in detached mode. The "detach at hinge" feature is less critical than being both a "tablet" (usable with touchscreen only) but with a keyboard for sustained text entry. And a hinge so you don't have to prop it up.

Compared with the Windows experience, Android is certainly lacking and it remains to be seen if Android N will improve it, but given that OEMs are now all betting on Windows 10 for that market segment, I don't see a bright future for it outside mobile phones.