How about forgetting about GUI altogether? To keep things concrete, I intend to write a file encryption utility and a password manager. The first versions will

How about forgetting about GUI altogether? To keep things concrete, I intend to write a file encryption utility and a password manager. The first versions will be command line programs. But of course, over 90% of computer users have this "unable to command line" disability, so they need a GUI. I was thinking of writing my own. Small, simple, and completely oblivious to accessibility issues—except maybe font sizes. Would that be okay? I mean, who cares about GUI accessibility if you can do the same thing on the command line? Unless the command line is not accessible for some unfathomable reason?