I'm trying to replace disposable paper notes with something that is simpler and more convenient. There are many lightweight LCD writing tablets like this one: https://www.amazon.com/Boogie-Board-8-5-Inch-Writing-PT01085CYAA0002/dp/B00AFPR68E/<p>But it looks like those are an LCD display with a touch sensor on top. I was looking for something with near-zero input lag and no visible pixels (like actual paper), like a more sophisticated version of a kids magnetic whiteboard.
Have a look at Remarkable 2. It isn't cheap but I think it's the closest to what you're looking for. There are some Chinese alternatives based on Android also with an e-paper display, but I think Remarkable 2 is better.