This definitely seems like an interesting and unique take on a pretty commonplace mixer setup (though maybe not too minimal).
l could see it being useful personally to integrate in my in the box, interface-based setup for mixing (with the monitoring and analog summing features), while also being useful standalone for live purposes.
Also, found this the other day and wanted to share here, but forgotâold studer mixer with built-in rotary phone (?!). Apparently was designed with sportscasting in mind, but I can imagine could be put to pretty cool experimental purposes. Wish it was cheaper!