Doesn't mean, I wouldn't use it for its advertised purposes too. But I really would like an eInk display as an add-on to my computer - unfortunately, the Kindle is not so open.
Would also be great as an extra screen for e.g. man pages while you are working on your main screen.
I don't know if the remarkable does this, but the onyx boox max 2 has an hdmi input (on some tiny connector.) I've used it from my laptop as a second screen, and displayed emacs and xterm on it. Really need to craft up some kind of bracket to use it as an outdoor primary laptop screen...
