Exactly this. Focusing not just on what you write, but how you find what you wrote is very important.

I started using Org Roam a bit over half a year ago. My policy with deciding what to store in it is: "is there a chance I will want to remember this later?" If yes, I write it down, and link it to something relevant, which allows me to find it later from the backlinks on that relevant note. I thought I had pretty good memory (I still think it isn't bad for a normal human) but I have been surprised fairly often that some tidbit of information that I want is neatly available as an atomic note, and I don't even remember writing it.