That's interesting, but also kind of underwhelming. I mean, if you understand the concept, why doesn't it provide: a) A paragraph-level analysis to account of

That's interesting, but also kind of underwhelming. I mean, if you understand the concept, why doesn't it provide: a) A paragraph-level analysis to account of sentence length variety b) A document-level analysis of the same type c) Suggestions for where sentence length needs to be varied, for example where long sentences should be broken, and so on. There's a LOT of books with guidelines to improve writing, but it seems like 99% of the tools are only brushing the surface at best.