Some SOL authors publish as they write, or close to it. I can't, at least not yet. Still finding my story, and things I've learned writing book five and planning book six have caused me to change major aspects of earlier books. But, I can see where it would be fun to react to reader comments, and I admire those who can publish at least close to what they are currently writing.
Anyway, I thought this Reddit thread with an answer from a historian about past serial publication like Treasure Island might want some discussion. Would love to hear from authors currently publishing as they write!