I’m currently using the enriched editor on a lot of my sites and I had a look at why I felt I needed it. The main feature that I really, really want (and why I installed it on many sites) is to have tables.
I think if you have nothing else new included in this editor then you should at least include tables. Being able to quickly whip up a table is a basic part of any word processor and it’s really versatile for doing simple layout stuff. I’m just not sure whether there are any theme-related problems that may arise form this.
The second most useful thing I would say is the find and replace button. That is also a very basic feature that we have come to expect as standard and is super useful.
So those two features would get my vote for inclusion by default. There was also talk about having some more features included that could be enabled using a filter (which is a neat idea - not readily available to the average user but can be added by the site admin). Obviously we can’t include every feature or it will be way too bloated. But I do like the code button that displays code (both front and back end) using a syntax highlighter.
I should also mention that I do think it’s important to have some new features included and a new “look”. One of the most common complaints over the years about CP is “But you aren’t doing anything. There is no progress”. People need to see something happening or they think the project is dead.