I agree we all want 300 DPI; pure white-levels; vibrant colours; super low refresh rates...
However, this is liquid paper; it's still nothing short of magic; for magic, I'm willing to compromise.
A big A4 color e-ink tablet is still impressive in my book; and yes my uses would be a lot for French-language graphic novels (bandes dessinées).
It does seem the black & white and color DPI levels are low. Any eink screens bigger than 10 inches all seem to decrease in resolution proportionally with size - the Boox 25" Mira screen is 145 DPI in mono.
Not sure how to take this, since I haven't seen an e-ink screen bigger than 10" with my own eyes. The thing is the capsules making e-ink are dots of varying sizes; this still makes a very authentic, natural image feel, which is a far-cry from rectangular pixels.
I was actually waiting for a Boox Tab X Pro to come out, or a Color, and now Sony's MooInk will be the first one.
There's an article with an overview of the device (in Taiwanese) at the following URL..
https://www.kocpc.com.tw/archives/530879
There is also a new 9 min promotional overview video released today (in Taiwanese) showing some of the capacities of the device at the following URL.
https://www.youtube.com/watch?v=VC2T6rQFZZA&t=307s
