append only log works, but skimming through 2 months of logs for a specific thing is poor and slow but very useful. I don't do that often but when i do need it sometimes and especially fast, like on a call, with no lead time. Its a superpower.
I now organize my notebook a with a few conventions that make it more useful.
I limit myself to using only the right side of a page for logs from whole week. Each new week gets a new page, always on the right side. Put the date as the page header. Makes skimming easier. Put any important tasks / targets for the week right after.
Further Split right page into 3 columns. First 2 for work logs, third column for recurring weekly/biweekly meeting stuff. Very easy to go back to what was discussed 2 months ago. All logs are usually 1-3 words. Just cues. but everything has a topic subheader.
Left page is free form for detailed stuff. Things i discover, design, 1:1 meeting notes, questions i need answers to, philosophy, anything new on HN, etc. Right page serves as context.
I also do an index on the first page of the book pointing to anything that i find repeatedly useful. Could do page numbers but i put the date as its naturally ordered.
Been doing this a while and works perfect. I have everything I need in one notebook, i can carry it with me. a $1 composition book with 50 pages lasts well over six months.
Lots of space to lay out your ideas and get a great overview just not very pocketable.
I use a lot of diagrams / sketches / arrows between things / etc, so doing it all in text on a computer is too cumbersome.
Of course, with paper, looking up something from the past is a pain sometimes.
Just fyi in case it helps : - )
I keep the notebooks but rarely look at them once they are filled. Maybe once or twice as I switch to a new notebook and then once again when it comes to yearly review time. A couple of times I have rifled through old ones looking for command line flags but most of the time reading through the notes is enough to jog my memory.