Re: So what should a a 21st century UI look like?
Voice recognition has it's niche, eg consumption devices or for accessibility needs, but on the whole, yes, it's much slower. In the same way when I want help with something, reading it on a web page is much, much quicker and easier to understand, flick through and flick back than watching and listening to a YouTube video. Video instruction also has it's uses too of course, when done well, without lots of spurious Umms and Ahhhs and tangential comments.