Do you say that from experience? I have both a Dasung Paperwhite monitor and a fairly hacked reMarkable 1 that I use for that purpose. Both work well for typing, as long as you type in a way that full refreshes are the exception, not the norm.

For text-based interaction, current-generation E-ink is more than suficient.

Source: Own an Onyx BOOX Max Lumi and use it in this mode frequently.