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It's easy to do color eink. Passive (ambient light illuminated) color electronic text will look rubbish until some new display technology is invented. You'd need Cyan, Yellow and Magenta layers that are either coloured or transparent. The R G B approach used by OLED, LCD and even CRTs* is simply far too lossy for ambient light. About five times dimmer than monochrome, also the RGB approach needs 900 x 300 or 600 x 600 dpi to give 300 dpi.
It's basic mathematics and physics. Unless there is a massive power of front illumination, and four times better resolution (for sub pixels) the colour eink will continue to be rubbish.
Mirasol isn't eink. It was in two products, but overhyped and too expensive, so if people wanted color the LED / LCD was a better option.
(* There was a nearly flat mono CRT, Sony and Sinclair. In theory a 5" colour model is possible, it used a screen at an angle to the electron beam) VFD graphic panels exist. They are rather power hungry and quite low resolution but bright and probably work from -60 °C to over +200 °C. Plasma panels are limited in minimum dot size and were last used portably in military laptops (orange only, but colour possible) about 30 years ago.)
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