Nokia? Quality? Might I remind of the N900 USB port problem? The same question of quality can be asked for other leading brands... Samsung and exploding batteries... It seems Apple still haven't learnt from the iPhone 4 Antennagate.
I do see your point though. I don't expect the quality of these Chinese brands like GPD and One-Netbook to be any better. Much less in fact. I look at these Chinese devices and I see design issues. The keyboards have awkwardly placed keys. The placement of the hinge on the GPD Pocket (1 and 2) makes it awkward to use the bottom of the touchscreen.
The thing is, if you want a modern computer (with either Windows or mainline Linux) that fits in your pocket, there aren't any other options. I'd love it if a leading brand made something similar but they aren't.
At the end of the day, there are many happy users of these devices, despite their quirks.