Seems like the thing that actually makes this all work is the built in battery on the mini PC. Without it, accidentally unplugging the power bank would be a big problem.
It is as bad as yanking the cord on your computer. I mean, not the greatest thing to do, but not the end of the world with modern filesystems.
I used a NUC with some battery pack for ages, accidentally unplugging wasn’t a big problem really. (Sadly smart glasses weren’t where they are now at the time, so I had to lug around some kind of display sometimes).
Towers are generally put in places where it's pretty hard to trip over the cord. I'm pretty sure if I used a mini PC as a portable, it would be a weekly annoyance...
