Interesting. I use a paper notebook to but it's the opposite of detailed. I use one when I have several ideas in my head and I need to get them out before I forget some, or when I need to figure something out that's a wee bit too complicated to keep all the bits and bobbles in my brain-RAM.

But I write down just enough to offload the memory to paper. They're literal notes. Just enough so that I can remember what I was on about earlier. But probably not detailed enough I could come back in a couple months and recollect the rest of the details. What's the point in that anyway? These are things I intend to act on. Once I commit them to code, then the code becomes the source of truth.