I write what ever is in my head with minimal edits. I wanted to have a place where I could express myself freely without being concerned about clarity or flow. Sometimes I tweak sentences that are awkward, but I don’t have an editing process after I’m done writing. I agree with you that it’s nice to just write what you feel in the moment — like taking a mental picture.
I also tend to write either when I wake up or before bed. I’m buzzing with stuff to say at those times:)