I've seen (in kobo documentation) statements that e-ink displays are good for up to about a million refreshes overall. At 75Hz that means a display might last about 4 hours total. Other displays claim up to 10 million, so that would be about a week's worth of regular work.
That could still get annoying though, since maybe the middle third of the display is going to get rapidly flipped on + off as you scroll through text/browse around websites. If that part of the display dies, but the outside 2 thirds still works, I think the panel is basically useless anyway.
I emailed Modos and they replied basically that the 1 million or 10 million refresh limits have been pessimistic in their testing — that they have not seen a display significantly “wear out”
Is there anything mitigating that issue?