You know, you're right. Nobody should ever try anything new with voice interaction. We should leave that shit off because its buggy or only knows how to do web searches based on bad guesses.
We shouldn't spend any time putting this stuff in front of users and learning what works well, what doesn't work, what people like, what they don't like. God forbid we try and see if there are ways to integrate it with how people currently use computers.
Instead, what we should do is wait until the 23rd century, when we have starships. Even though we've done no incremental work between now and then, in the distant future, voice recognition and natural language processing is just going to be really, really good, because The Future. It's just going to build itself, and when we are bald and say "COMPUTER" to our starship, its going to listen and then do exactly the right thing, and nobody is going to ask why the bridge has so many buttons and levers and consoles and shit if there is a ship-wide computer with unlimited power and perfect human voice recognition. And we're going to gloss right over how a near-Ai level of natural language understanding still needs us to say COMPUTER first before it figure out who we're talking to, as if anyone else on the bridge could execute the command we're asking when we're staring off into nowhere instead of at another human in the same room...
Anyway, I'm running 9926 on two machines - neither of which are touch-enabled. I've never talked to the thing yet. It appears to run faster than 8.0/8.1. The start menu behavior is better, and you can flip back and forth between little-menu-on-desktop or "big screen of metro" with a simple gesture.
The UI feels positively snappy. The paradigm has been reversed entirely from 8 - now, metro apps run on your desktop - instead of your desktop is some weird bad neighborhood nobody wants you to go to.
I think a lot of people will like Windows 10.