As I like to have a 1 for all device and I like to travel with it I allready hv a detailed idea what i would like to have (So forgive me the long text). And since purism seems to have managed to get convergence to work and I like their open-source and design style it would be superawesome to have one like the following from purism:
3 in 1 device (phone/tablet/laptop) featuring:
phone (librem 5; +keyboard like the n900 + radio sender/receiver (FM))
tablet: basically just a 11-12" 3:2 screen with no other hw. put the phone into a slot at the rear site and you have a tablet. the slot at the rear site should hold the phone so save that you can handle the screen and the phone as one device (not just connect them with a cable). let the front camera of the phone peak out (or have a hole in the tablet so one can use the phones front camera as the front camera of the tablet. Beside the phone one can attach 1-3 batteries of different sizes. The batteries have their own housing and attach to the rear side of the tablet with hooks that snap them into place. That way the tablet gets less bulky the fewer batteries one attaches and gives you longer battery life the more batterys you attach. A little battery to usb adapter that is stored inside the housing of the tablet and can be taken out gives you the option to use the batteries as powerbanks for the phone (leave tablet section at home and just take the phone + battery + adapter for a hike).
A foot stand enables you to place the tablet on the table upright.
The screen should be bright enough be be read in daylight an be able to be dimmed very much. Also it should be non-glare
A must have for me: One should be able to write on the tablet with a passive pen. (compare toshiba z20t (see link above). The pen is stored in the tablet.
A alternative “tablet” would feature a e-paper screen.
Laptop:
Just attach a keyboard to the tablet and make it a full featured laptop/convertible. The keyboard also holds the tablet (like lenovo helix or toshiba z20t). Not just a flappy keyboardattachment like lenovo x1 tablet that makes it nearly impossible to use the device as a laptop on your lap! The laptop should be able to be opened until a angle of 180deg.
The batteries that attach to the tablet also can be attached to the keyboard.
The keyboard section of the keyboard (the keys) should be able to be switched. So on can offer different keyboard layouts. Some keyboard layouts have big keys (but less). Some keyboard layouts have small keys (but additional keys). (I personally liked the small keys of the Asus Eeepc as is means much less moving of your hands/fingers). Some keyboards maybe even have a V-layout of the keys to be more ergonomic. Of course the option for a pointing stick with 3 dedicated mouse buttons must not me missing!
Last but not least the keyboard should be able to be connected to the phone/tablet via blue-tooth.
Well. Thats it. My dream-device.
Too much text? Sry. I just tend to know what I want when it comes to my gear 
(heaving toshiba z20t-c as laptop/tablet-convertible right now; hoping issues with gnu-linux are solved in debian 10)