I'm wondering if OP is able to make good use of all this 'self-logging' and find something interesting in these 100 notebooks. Is there anything worth having written ~1 page a day for, or not?

Maybe it's not the act of saving for later, but expressing it onto a concrete format to get it out of your head.

Not OP or the author but is "therapy" a worthy enough goal? I sometimes look back at some of my notes and feel a (nice) sense of time having passed by. Reminds me of how much little time we all have :)

That a lot of the time, notes aren’t used