Comment by skydhash

Emacs is ultimately an REPL environment, but ones where you can bind commands to bindings. And there’s a lot of bindings possible in a keyboard.

A mobile experience can be fine if you want a restricted subset of commands. You can then map them to buttons. But the core emacs experience is the ability to create your own commands and have different bindings.

The closest implementation, IMO, would be a streamdeck like UI, but with a transient or hydra like UX.