Is "The Day Before You Came" Abba's Crowning achievement?

Abba has had many high points throughout the 10 years their career (initially) lasted, one could point out albums like Arrival or Voulez-Vous as "their best" and I'd be more than fine with that. But there's something about what, for forty years, was their last album "The Visitors" that truly makes me say "does it get any better than this?" The whole somber atmosphere, unusual lyrics and haunting melodies, the group was coming to an end and they could tell. This song isn't originally part of the album, and was later added as a bonus track, but I find it Ironic that the last song they recorded, ended up being their best one and peak achievement. The song doesn't follow a conventional structure; 6 minutes, no Chourus and repetitive drum beat that perfectly represents the song's lyrics. The ambiguity of it, you don't know what is "It" that really came to this woman's life, could be a lover, death, etc. But you just know, through the mundane but effective description of her day how unhappy she was. You truly never know what happens when the next day arrived, and that's the beauty of it.