I didn't know this term but it really resonates. A general lack of seriousness in nearly everything is a defining aspect of our time, it seems.

Yea, this "lack of seriousness" really gets under my skin, and I really hope there's a broad cultural backlash to it soon, as this being the permanent culture seems toxic and exhausting.

That said, this is about the messaging aspect. Trump say could lack seriousness of rhetoric, but still be seriously pursuing his self-interests.