Editing is difficult; especially difficult when it's your own work. Professional writers will often advise reading your writing aloud. This helps you find errors with narrative flow, voice, and sentence structure, but I'm usually writing in public (i.e. at a coffee shop), so that's not normally an option.
Siri is a great editing tool, and now I can't imagine writing a post with out it. When a blog post is in the editing phase, I'll plug in some headphones and listen to Siri read the post to me. The first time I'll listen intently, and fix glaring flaws. Each time afterward, I listen less and less attentively, only fixing what pops out at me. Sometimes I'll even go for a walk while I listen. Being outside and moving around seems to help me untangle particularly pesky prose.
Hearing your wording aloud and with someone else's voice, inflection, and tone can really help you fine tune things like punctuation, voice, and structure. Generally, with Siri, my writing is better, clearer, cleaner, and more concise.
2 This post is partially inspired by Jesse Jiryu Davis's excellent talk at PyCon 2016.