I write my posts offline in Markdown in the Byword app, a real distraction free text editor. I tried Gutenberg, but the block style editing was slowing me down. And because the writer is focused on interacting with the GUI to create new blocks of text/images, the experience is actually quite distracting. Gutenberg does not support Markdown.
To borrow from a review on WordPress.org.
When I write I do not think “Paragraph Block. Hard line. Paragraph Block. Paragraph Block. Image Block. Blockquote Block.” The Gutenberg editor breaks a natural free-style of writing with these partitions that force me as the writer to think about the type of content I am authoring instead of the message being communicated.