I don't know if it is convenient to ask for keyboard input in PICO-9 so we could have micro adventures with parser input, old adventure text games so we should enter actions in this way:

>KILL MONSTER

What do you think ZEP and people? Would it be contrary for the nature of the fantasy console?

How would you map joystick then? There's hardly any configuration easier than arrows+z/x to operate when you don't have gamepad.

if they are not mutually exclusive, it would be no problem

It would be a Pico-8 Micro Computer then.
However, even some pure consoles had keyboards.
Dreamcast had one. As did the Gamecube.
And there were keyboards for PS2 and xBoxes as well.

If Pico-8 gets a keyboard support, I'll start churning out little demakes of typing games. Like Typing of the Dead.

Btw, the Gamecube keyboard looks awesome.