Thanks for the comment, Jessica. And thanks for the link to the Manifesto—that’s always worth a (re-)read!
I allude to this a bit in the article, but I think we’re at a similar inflection point with voice as we were with mobile when Brad Frost posted that.
In both cases, I like to think of the human mind (in all of its wonderful squishiness and unpredictability) as the final platform for which we write, design, and develop; everything else is there to facilitate the connections. The sensitivity to interfaces you mention is critical to making those connections work.