I would think if you aren't trying to develop a brand then you may as well just make the blog private.

I love keeping a blog as my own private journal. I wouldn't want it public though because I can keep it as unstructured/messy as I want with it being private. Mostly a collection or random notes / thoughts / code that I wouldn't want a potential employer to get an impression of me from.

It has huge value to me. The value of reading someone else blog at this point is basically zero to me. Mostly throw away, surface level articles for branding and networking purposes but if that is the dance you are trying to learn then it makes sense.