Giving me major nostalgia for the Optimus Maximus (https://www.artlebedev.com/optimus/maximus/) keyboard and its successors. This one looks like an interesting take now that displays are even higher resolution, have haptic feedback, etc.
Definitely my first thought when I saw this too. That brings me back to the good ol' days.
(Combined it with a BMW-designed Level 10 case; quite the looker but monumental and monumentally oversized.)
The Stream Deck isn't doing anything particularly exotic with its key mechanism, though (from what I can tell, there's a frame between the LCD and buttons with the actual contacts on it; no Hall-effect sensors or anything like that).