"Steve - it is Steve, right? You say this gadget of yours is for ordinary people. What on earth would ordinary people want with computers?" (Pirates of Silicon Valley)

Yeah. But on top of that, people often don't seem to know what they want, so the whole premise seems iffy in the first place. On top of that, i think focussing on 'why now' leads dilution of ideas, in the sense that too many people seem to jump onto an ailing bandwagon when it's a bit late, because well, now's the time.

That's hardly true--enabling professionals can easily be more world-changing than catering to people who are not "tech savvy". Plenty of technologies--take SQL, for example--are very world-changing but only ever used by tech-savvy people.