I don't want to put private thoughts in my blog. And not all thoughts are thought through.
I want to use this blog as a recycling container for comments and ideas I post in communities. But it's far less personal than my journal.
But it really does help to write down all the things, even if the only audience is future-you.
[*]: That email actually only contains a sentence: "Hey, here's something you need to read today. Search your journal for $RANDOM_UNIQUE_STRING and you'll find an entry written 10 years ago for you by your former self."
Do you put in any effort to make it readable for others? I imagine this is a significant part of blogging.
Posts don't have to be well-written to mean something in the future in the same way that mediocre photos can carry quite a bit of feeling and emotion when you look at them after some years.