We're now seeing over 235k posts a day made using the Gutenberg editor. The iOS and Android versions support the majority of the blocks now, and are being re-licensed using the MPL so they can be easily embedded and used by other apps. There's a public release of the Gutenberg plugin every other week and we're relentlessly working on making it faster, easier to use, and more flexible. People are creating things they could never have done using the Classic editor, and that's really exciting.
And of course the beautiful thing about open source is you can customize it and use whatever editor you want, as someone else mentioned, and given WP's very open APIs you don't even need to ever touch any of our editors, you can post using wp-cli, Git, Emacs, third-party desktop clients, sending an email...