I work sitting in a chair, looking at a screen. If I were to work using one of these, I would just plug it in like my computer and screen currently are. Though it would be nice to go outside and work in my hammock, on a gigantic floating screen!
I can't imagine writing code using only my voice.
I agree that dictation would not be enough for most people. I don't code, but writing emails is not a fun experience with Apple's current speech-to-text offerings.
(I trust that technology has improved over the last 15 years, though Siri is fairly similar.)