Precisely, the users, by definition, care only about the user interface. The matmul machine can be hidden in any box, just that so far it has been tied in same

Precisely, the users, by definition, care only about the user interface. The matmul machine can be hidden in any box, just that so far it has been tied in same box with the screen. Hence why the greater point is that thin clients are relevant if the user owns the matmul box.