Warn user of the consequences of setting retention on folder
When end users chose to mark a folder for retention, it marks EVERY document within that folder with the same retention label. At large scale, it is only possible to fix this mess via Powershell.
It would surely be better if the user was warned of this outcome in advance with an "Are you sure?" message. (Admins could have the right to turn off this message on a site-by-site basis or at a global level.)
Jon Bramley commented
It's a real pain to fix this
This would be a very useful addition and prevent many accidental actions. In the long-run much time would be saved if administrators didn't need to undo the labels for the user.