It's bit surprising that word processors would struggle with long paragraphs considering that various stream-of-consciousness and related styles of writing also

It's bit surprising that word processors would struggle with long paragraphs considering that various stream-of-consciousness and related styles of writing also eschew paragraphs and possibly other conventional structures. They might not be super common, but not exactly unheard of either. I'd assume writers and publishers manage them somehow. Random recent example: https://en.wikipedia.org/wiki/Ducks,_Newburyport https://en.wikipedia.org/wiki/Ducks,_Newburyport