Of the Czech and Korean newcomers who open an editor, about 27% of Czechs and 29% of Koreans don't save an edit.
Topic on Talk:Growth/Analytics updates/EditorJourney initial report
Micro survey of users who open editor but don't complete an edit
@KHarlan (WMF) -- I think that's almost exactly what MoodBar did, which @RHo (WMF) looked into when our team was planning the help panel (see this task). I think there probably was some good information collected, but the feature was pulled back because the experienced editors weren't going through the queue of feedback and responding to it. I wonder whether it would be easy to bring that feature back to life on our target wikis for a limited time, to see what people say.
@MMiller (WMF) Thanks for link, I had forgotten about that task. AFAICT QuickSurvey seems to be pretty low impact in terms of engineering effort. We could research exactly what's entailed if you're interested.
If we decide to try this, something to consider as well is tying the quick survey with help panel. For a user who abandons the edit (and has not already used the help panel), we could include a link in the quick survey to open the help panel if the answer chosen was something like "I couldn't figure out to do something" or "It was too hard to edit".