Dunno man, sometimes I blog stuff I want to remember (how to do task X or Y, some arcane ffmpeg incantation, recipes, etc) and when I need it, it’s easier to find it in my public blog which is accessible from anywhere, vs. it being a file buried in some computer I have to sit in front of, or somewhere in a shared drive I have to authenticate to, etc.
For some things there is value in them being publicly accessible even if nobody but me cares or uses them.