So, recently I purchased a reMarkable 2. A decade or so ago, I decided to learn Gregg Shorthand (Simplified). It was a big time investment, and to be totally honest, even though I have become fairly proficient with it, it tends to be difficult to read my handwriting; it often takes me a while to decipher old notes where I can't quickly get some idea of the context. But, for notes where you sort of remember the context (like a meeting that you had earlier), it can be very effective since it tends to be fairly easy to read them, and you can take notes quickly and also get some added brain/retention benefits from writing things down.
This is a companion discussion topic for the original entry at https://www.doliver.org//articles/focus-gains