I would like to write something, but I don’t want anyone to leave comments for whatever reason, no matter how “constructive” it is. I don’t care about compliments either. Is it possible?
As far as I am aware that's not possible The next best thing you can do is turn off notifications for comments(click on that weird arrow thing in the top right, then "my stories" and "Notifications")
Currently, it is not possible for story owners/chapter authors to disable comments on their stories/chapters.