Looks great 
Given that we’re no longer bombarding members with long lists of preferences, please take the opportunity to add occasional explanatory text under any options that aren’t obvious.
“Mailing List Mode” - for example - the grey text underneath it explains that it “overrides the activity summary,” but doesn’t actually explain what “Mailing List Mode” is, in practice. [edit: I see @codinghorror also mentions this specific point]
Even as an admin and long-time Discourse user, I’m a bit unclear on the exact implications of some of our settings.