If you've never used vim, markup language and pandoc then it's a big upfront investment. Also keep in mind that the people listed that use WordStar have worked with it for literally decades. If you've worked with Vim for decades, what would it take for you to move to an alternative?
Good thought. Familiarity and muscle memory are a big asset. As a long time emacs user, I feel the same about my tool of choice. It's not always about being the absolute best tool there is, but about being one that you know inside and out - you no longer need to spend a lot of time figuring out how to do something, you can just do it.
