I find it useful for storage. I digitalise everything with an automatic feeder scanner.

I am using hundreds of sheets of paper at any given moment. Those I don't use, I archive in boxes(if they are important) or throw them away(after digitalising).

I travel a lot, so when I need some notes, I just print them again in color whenever I am.

I only process the notes automatically with an AI in order to search. But nothing sophisticated and storage is cheap so they remain a high quality image, I do not bother making it into a proprietary eink format(although I calculate it for searching).

I do not use the iPad for that, because paper and color pens give me way more real state for way less money and eink capabilities.