Ok I get what you’re saying, but I think there wouldn’t be sufficient demand for that. Most would probably buy a laptop for that away from home/office use case.Yeah it’d stay plugged in most of the time, but you take it with you without shutting down, just like a laptop. And you wouldn’t need a UPS just like a laptop. And you could use it anywhere, just like a laptop.
You could use a monitor that plugs in at home and office, or use a laptop or iphone to control it.
But the new mini may well be powered via a USB-C cable instead of having an internal power supply. If so, you could use one of the battery packs that support USB-PD to use the mini when you’re away from AC power.