It sounds to me like this needs something that enables it to be used on a person's lap without a kickstand behind it. An external keyboard that holds up the screen rigidly at the hinge. It sounds like an easily solvable engineering problem and frankly a dumb thing for them not to come up with immediately.
Viewing angles of the previous Pros makes a kickstand on my lap moot - since I am also writing as well as typing on the device (and drawing).
A ridgid keyboard hinge is something other OEMs already catered to, a point of having other OEMs allowing for a more "traditional" laptop feel of solely using a keyboard (and possibly trackpad) and touchscreen. In short, more hardware options, not solely in the mindset of Apple solely controlling the hardware releases.
I can name the Yoga being the top of my mind of catering to such.
Again, the issue rises, when I write with the pen. Propped, it is going along with writing on a vertical surface like a whiteboard/chalkboard. Inclination, is not something that I find at all nice when writing or drawing, either on a table or lap via propped manner.
I saw past tablet PCs before such as a Samsung ATIV 700T that does follow that solid hinge. Problem with that is, many find the keyboard base too light, but adding weight by external battery would increase the weight - thus not satisfying the other camp complaining about "weight issues". It also does not satisfy the camp of needing to undock and redock and wearing the mechanical locks for certain deployments.
The 700T, also cannot fully hinge back, meaning I cannot easily write + draw and go back to typing at the same time.
Something, that many would not see right away - given many on hands reviews as one from Anandtech being just typing journalists. A comment I have seen, is a proper review would be had in the hands of designers, artists, and engineers. People that outright would create and use the device in full, orchestrating that entirety of past and present software that is capable, with hardware and form to match.
Something I have not seen before, something the market if all OEMs follow will not allow due to the "follow the leader" mentality.
For the record, the current Surface Pro 2 I have, lies flat on my legs, keyboard slightly declined on my lower stomach for typing. If need be, both are resting on the full stretch of my legs. Indian style sitting, both are cradled in between my legs, giving me ample room for typing AND pen work with touch.
Edit:
And yes, with those deployment methods, the type cover keeps up with me typing, with no problems.
Even with the on-screen keyboard, the split thumb keyboard is my preferred method of input, giving my thumbs adequate typing while in a tablet form. This isn't utilized often, more or less quick bursts while two handling the device when needed, along with a pen on some occasions. Being the Pro 3 is lighter, this would be more conducive - being that the form area is more comforting like a clipboard, instead of a narrow 16x9 aspect, would possibly be better - of which I would like to test one out.