They are not done right ( a few samples )

 

Microsoft Surface Duo

My suggestions as a layman are :

1.   The GUI should have the same look and feel like the Windows          10  Desktop-version  regardless whether it is a  Laptop , a

      Tablet  or a  Smartphone or  a

     Laptop/Tablet/Smartphone (ALL-in-One) so

     that       you feel-at-home when  using it .  

2.   The processor should be  INTEL chipset .

3.   The OS should be full desktop-version of  Windows 10                       Operating System so that we feel-at-home when using it . 

4.   The  Microsoft Surface  Duo  when unfolded , it should be                 15.6 inches , meaning it should become  a   15.6 inches Tablet ,         just like a   15.6 inches   Laptop  WITHOUT THE                               KEYBOARD .  Currently ,  the Microsoft Surface Duo                       machine when unfolded , it is only    8 inches   and that screen           size is  too small for a    Tablet , nowadays .