Re: Why aren't you taking notes?
Taking instructions that you need to be able to recall for a few minutes is very different from learning something that will stay with you for weeks, months, years, or your entire life. That, I think, is the difference that this research (and the empirical evidence it is based on) is concerned with: "Learning", as opposed to "short-term recall".
For myself (and yes, everyone is different) I developed my own "short-hand" for note-taking in class, enabling me to take notes efficiently while still paying attention and "absorbing". BUT, I would then revisit my notes shortly after the lesson and transcribe to long-hand. That probably helped as well, by further re-inforcing the information by conducting a replay and revise exercise while it was still fresh in my memory, in addition to the notes I was transcribing.
Digital notes offer additional advantages such as searchability, linkability, referencability and flexible re-organisation.
These days we get the best of both worlds and for several years now I have been using an eink note book (reMarkable2) for day-to-day note-taking and for taking notes when working through things like udemy courses etc. For day-to-day to do lists and journalling I use a BOOX Note Air 3C - for productivity tasks (journals, to-do lists etc) the ability to use specific apps but still gain the embedding/retention benefits (*) of hand-written interaction with the device is a God-send, but the reMarkable remains my go-to for distraction-free, general note-taking and brain-storming.
* if I plan my day by typing into a list, I have to constantly consult my list through the day to remind myself what I was setting out to accomplish. If I hand-write my to-list I find I remember most if not all of the list, only returning to the to-do list app at the end of the day to update statuses and prep the next day.