Punctuation has evolved over time as a means of transferring a story from the writer to the reader without the reader having to attend to the medium.
If I have to work out where dialogue starts and ends I'm spending more time concentrating on the typed words than their contents. More time on the author's idiosyncrasies than the story.
I'm not interested in the former, I want to enjoy the latter.
Punctuate it and I might read it.