I like that the settings to configure the defaults work exactly like the settings in your preferences. This makes it very easy to transfer the settings from your own preferences as the default for users.
I am interested in who disables it for all users without letting them choose. I know there are some topics here where people want to prevent users from unpinning topics in general, and I can understand that. But why do you want them to not be able to enable automatic unpinning for themselves if that’s what the user wants? I mean, if I want unpinning and I am not allowed to change the preference, I can still manually unpin all those topics.
Discourse reminds me that this topic has already been solved. Would it be possible to move this to UX?