This is sort of my thinking too. It's finding next token once the previous ones have been generated. Dashes are an efficient way to continue a thought once you'

This is sort of my thinking too. It's finding next token once the previous ones have been generated. Dashes are an efficient way to continue a thought once you've already written a nearly complete sentence, but it doesn't create a run-on sentence. They're efficient in the sense that they allow more future grammatically correct options even when you've committed to previous tokens.