Hi, we evaluated it initially, but Gutenberg was continuously evolving and changing. Anyway, the real problem is this: blocks designed for web pages do not work on emails. Emails need a lot of tables the keep the formatting on every email client, so using Gutenberg means reprocessing all blocks to make the email-ready (if possible, I don’t know).
Not only: all the custom blocks from themes and plugins won’t work on email clients (structure, missing CSS, and so on)… it would be a disaster 🙂