Well, it says it on the tin. Is it a nice to have, or essential that you don’t have?
I think it would be really nice to have - all modern editors have some forms of it.
I think it’s essential.
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THIS ^^ 
cu, w0lf.
Not at all important to me. I’d prefer a conservative approach. Cut the ties with WordPress, fix known issues that never got solved.
Which “issues never get solved"? If you’ve been following ClassicPress for any length of time, you’ll know we’ve addressed a ton of them, with more to come. If there’s something specific you’d like done, say so. Sweeping generalizations are both inaccurate and unhelpful.
I think you misunderstood me.
I wrote fix known issues that never GOT solved 
in WordPress
No, I have not been following ClassicPress. I just found it. And it’s a relief to just pull open the old editor and have it quick to load, quick to save.
I am not aware of what bugs you already solved. I just knew there are/were a bunch, including one that got reintroduced when the customizer was built, I’ll see if I can dig it up later.
…ok, let me quickly recap: CP is way faster and works better, because first and foremost some of WP old bugs were indeed solved (GitHub is a great place to see which ones). Also it got a makeover in the old JS libraries like JQueryUI and bacnone.js that we are very near to get completely rid of (Tim is reworking the customizer engine completely in PHP so that we can get rid of backbone.js completely since it was already removed in all other parts of core. that will make customizer more easy to maintain in the future). Next we will work on the editor, and the question here was pertinent to it because undo/redo is in all modern ones.
It’s not all but it’s a general idea of how far CP has gone in terms of improvements.