@volanar you can see posts’ edit history and restore different edits as admin. You can even see who edited it. What’s in the plugin you are talking about is already in core, most likely why it’s outdated or something.
[nodebb-plugin-question-and-answer] Feature request
Link to GitHub
Now i've really wanted to use this plugin, although there is something theres missing which would really improve the plugin, it's also added on the "TODO" list but i haven't really found any progress on it lately.
Now I thought if it really would be hard to make a "Select as best answer" option for the person who created the thread, that would automaticly lock the thread and set it as "SOLVED"