I often start in Google Docs or MS Word (depending on if I'm writing for a personal project or for my day job). Then I'll paste everything into Gutenberg or classic editor depending on the site. Doing so never works seamlessly, and I'm always manually fixing tags. But in doing so I catch stuff and correct it inline. By the time everything is copy pasted over, it's basically a 2nd revision.

If formatted copy paste from MS Word or Google Docs to Gutenberg ever works as well as it probably should, I might start publishing first drafts. :)