Behavior of 'Default Notification Settings' page

The 'Apply changes for existing users also' option only applies the last changes.

That is, that page should be used to configure the predefined notification settings for your website, and the selected options should apply ALL options (just changed now or not) to all users.

Otherwise, to ensure that all users have the default predefined options, you must change each option twice (at least) for the changes to take effect. It is counterintuitive.

Summary: If I click on 'Apply changes for existing users also' option, I expect that the settings set on that page (just now or before) will be applied to all users.

I can see that point, but it still seems counterintuitive to me.

Let me explain my last use case (not a common use case):

I have created several test users (alpha and beta) and I wanted to test the notification settings. I have used the Default Notification Settings page to set all notifications as active. I have applied the changes to all users.

However, when I checked my account notification settings there were no changes and I did not understand what was happening. My question was: How is it possible that I have set all notifications on as default and the changes have not been applied? Until you explained that point I was unable to see it.

I suppose it may be an exceptional use case.