This page is asking you to confirm that you want to leave - data you have entered may not be saved.Whether or not I've actually written anything. Previously that message would only pop up if I'd started to write a comment and then tried to close the comment box. It's a great failsafe against accidentally the whole thing, in that you have a prompt that essentially says, hey, dummy, you really want to delete all that stuff you just wrote?
It is much less useful if the box pops up every single time, regardless of whether you've actually written anything.
And that's the problem with safety-related things and warnings. As was pointed out in my post about the couple that plunged to their deaths taking cliff-selfies, it is quite possible that we have tried to "lawyer up" to the point where we're over-exposed to warning labels. We've so thoroughly cluttered the landscape with danger signs that they all fade into the background.
There's a lesson there; unfortunately the people that desperately need to learn that lesson won't get it...
That is all.