Thanks for the input, everyone, this is all great to know.
Just to give a little more context to this: I’m looking to make Write.as / WriteFreely useful and usable for more people – particularly, less tech-savvy writers. We’ll continue supporting our publishing API for developers, and the current editor for those comfortable with Markdown (or copy-pasting, like @Aris), but the goal for the Classic Editor is to cover everyone else who doesn’t find a writing experience they enjoy in what we already have.
Between this and our upcoming plugins / add-ons, I’m also imagining a future where we offer new users a pre-packaged combination of editor and add-ons that fit their use case. E.g. a business user would get a particular subscription and set of add-ons by default that a casual blogger wouldn’t. Not 100% sure on specifics right now, but that’s the bigger picture.