There's enough to do on any boat, especially when it's been used as long as ours.
We find it just right for what we do so rather than change much, I mostly just keep up with the maintenance it needs. When I consider adding some system, I look closely these days at what it adds in upkeep time and repair time it may(will) add.
The longer I sail, the more I appreciate the simple things that make sailing so pleasant for us. But there are good evolving ideas that can make time on board even better, so the list may never shrink....