ABBA’s “Dancing Queen” is a song about death
vice.com
vice.com
Edit to add: You only ever have one first time for anything.
Still, I think they're missing the point of ABBA's catalog. It's about being alive despite the pain. This song celebrates youth, and doesn't want its subject to know about hardship. The divorce songs have an uplifting groove to get you through the hard parts of life.
It does show a bit more to ABBA than just disco shallowness. But it doesn't have to be about goth depression to be deep.
ABBA wouldn't have had the hits they did if they weren't ~deep~ real.