Mastodon is small enough that I don't feel as weird rambling here as I do on other sites. Some combination of "hardly anyone will see this, it doesn't matter" and "It's quiet around here so people won't mind if what I'm saying isn't that interesting."
When I first started online blogging, back on OpenDiary in 1999 or whatever, I wrote whatever popped into my head.
But at some point, I became self-conscious about posting to my own feed, in LJ or Twitter. I ... still haven't decided if that's a good thing or not.