Why blog if nobody reads it?

But blogging for work rather subtracts from the pleasure for me. I know people who originate content and blog for pleasure which is consumed for work. That seems to be a better fit.

I agree with much of the sentiment here. You can diarise, a zettelkasten isn't a bad place to be. Inviting readership constructs a binding, a contract writer to reader. It's building commitment: to produce, and to reflect on what readers say, and to correct honest mistakes and accept (some) criticism with good grace. Shame about the negging: George Megalogenis's blog had a byline up top of the comment pages "my blog, my rules" and you can't really object to that. Boring and abusive replies get chucked. Fair enough.

I once read from a comment in HN or a blog saying that, in the future writing will be like workout; in the past the daily physical labors forced people to build muscle on some aspects, but technology freed people from the labors as well as the muscles. Now if you want to build muscle you have to workout. Writing and organized thinking is going to be like that in the future: only those who wish to and take action to build organized thinking muscle will have them.

That is why to me writing itself is valuable, even if nobody reads it. Bonus points if somebody stumbles across my blog and it somehow builds my credibility.

If we accept that nobody's going to read it, then the content doesn't have to tell it for the audience. Not the content, nor it's tone or style or anything else. You can use obscure references that only you understand as a shorthand, like words that your family made up when you were small.