[asoneth]

Many folks in my office have an ancillary monitor or two to the side of their main monitors, often in portrait mode, just for keeping docs, diagrams, and other reference material. But having so many backlit monitors in your field of view can become a little fatiguing.

An e-ink display with sharp text and without a backlight could be useful for such a use case.

But agreed that mobile contexts seem more broadly useful.