Here’s my reasoning: I assume all files in my Dropbox get synced correctly; if something goes wrong, I’ll be able to tell by the red warning icon anyway. Why would I want the green checkmark icons? They only add visual noise.
@tubbo That’s still possible when the green icons are hidden: no icon means it’s synced successfully.
For larger datasets, such as Logic Pro projects, you can tell exactly which files have been synced so you don't accidentally open up/save and corrupt your projects.