In my opinion , examples of  a true and a  real   [ Laptop/Tablet/Smartphone (ALL-in-ONE) ]  machine are  :

 1.   15.6 inches  Touchscreen  "360 degrees foldable"  5G Cellular Laptop with

       built-in DVD-RW Player , that look something like this .

 

2.    15.6 inches Touchscreen  "detachable"  5G  Cellular  Laptop  with built-in

       DVD-RW Player , that look something like this

 3.   15.6 inches  Touchscreen  5G Cellular  Tablet with built-in DVD-

      RW Player , that look something like this

4.    5G  Dual-Fold Smartphone  that can unfold into a   15.6 inches

       Tablet , that look something like this , connected to  a DVD-RW

       Player via OTG cable or Docking Station

5.    5G  Tri-Fold Smartphone  that can unfold into a

     15.6 inches Tablet , that look something like this ,

       connected to  a DVD-RW Player via OTG cable

       or Docking Station

5.     A 5G Smartphone that can expand into a   15.6 inches  Tablet ,

         that look something like this , connected to  a DVD-RW Player

         via OTG cable or Docking Station