I've been thinking about color e-ink screens since I made my post. Almost everything I read is fiction so that's what I really care about.
I do a lot of short reading sessions on my phone in between longer sessions on my Kindle and I have the reader on the phone set to a sepia background with dark text. I really do like that combination so maybe even for me a color e-ink screen might be attractive.
I wonder if they could make a sepia e-ink screen.
Barry