We keep referring to it as a
Flash 
which causes the conception of
bright.
Blink an LCD/CRT display ind you get a
bright flash.
Remember those "flip" digit/letter signs that used to be used in Airports and clocks? That is closer to what an e-ink display presents.
Bright light (sunshine) vieability
and really long battery life (days, not hours)
Make the blink worth choosing e-ink over LCD for a reading device.
Page turns are still faster than a normal human can turn a page (without ripping
the page).