AI chat is creating an opportunity for a new UX paradigm, here a walk through the previous ones to explain why and put it in historical context.

The first screen based interfaces combined the input and output into the same UI element, with a line at the bottom with a specific character set that prompted you for a command. And there were a bewildering array of command prompts, which reflected the kind of heterogenous design environment which is a hallmark of any early period of technology, from pre-smartphone cellphones to commercial aircraft before the jet age.