When I started taking notes with obsidian I almost fell into this trap of over-analysing everything in terms of what should go into a note, making folders and sub-folders. It became quickly obvious to me that the mental burden of this can accumulate quickly.
These days I store most of my notes in one folder. The only times I now make a note are: 1. When I'm reading. 2. Very rare these days, but sometimes I still have nagging thoughts that wants to be written down. 3. When I have important information that needs to be stored, like IP address, things like this.
I've found that not thinking about notes obsessively like this helps me better, most thoughts are useless and fleeting, they're not worth writing down imo. Best to be in your mind in those.
The outcome of this is that my vault has remained simple and small even after a year, and when I search it for information it is almost always for some important detail I knew I wrote down, I don't get overloaded with junk.
To keep my notes space clean I also regularly move things to archive, which I rarely check.