Back in the 90s, when I worked in consulting, it was business as usual to have a meeting with the client and the next day be back with a mock-up of the application features or interface discussed the day previously. It might have been VB, just GUI with nothing behind it, but clickable. It might be a few flat HTML pages (that would be connected to a database if it were real). There would be no graphics or "polish", it might be literally just black and white and maybe a little line drawing or clip art. The user could play with it and say yes, build this for real and make it look pretty, or let's change this bit, and we would and be back the next day. We even had a fancy name for it, which I can't remember offhand, like Rapid Prototyping Workshop or something. Competitors of ours did this by sending it offshore and having it worked on overnight but we never did 'cos it was as much work specifying it in enough detail to do that that we might as well just hack it up on laptops ourselves in a hotel room.

Anyway, not only is this approach nothing new, but at no point was it ever claimed that anything existed that didn't, and clients were very happy with this approach (esp. if they'd been used to "business analysts" drawing "data flow diagrams" on paper then coming back a year later with a steaming pile of crap that did nothing anyone actually wanted).