Any artist, in the end, reaches a plateau where new albums, no matter how good, don't make their mark like they used to.
I was never really a fan of U2, but if I take a look at their discography, in the earlier albums there's always a song or two that I recognize, if only by name. From Zooropa onwards, I look at the tracklists of their albums an there's nothing I recognize.
Heck, even Lady Gaga, the other pop artist that could have somehow drawn me to her music, the last I've heard of her was the Joanne album and that's just because it's not so dance-y, I know quite some songs from that album, but after? I know she made an album after that, but I never heard a song from it and I couldn't tell you in which year it came out. In comparison, it was impossible to escape Paparazzi or Bad Romance. What's the latest and most recent "it's impossible you never heard it" song from Lady Gaga?
Up until the Folklore / Evermore albums my general perception is that Taylor was churning out milestone after milestone, classic album after classic album. Now the gut feeling is that The Tortured Poets Department won't be able to give to the world that one song that "everybody" knows. I don't think there's even an Anti-hero on this album has it has been discussed above.
Overall I like the album, so I'm not criticizing the album itself, but I think Taylor might have reached that moment in her carreer where, no matter how big you are, the super mega classic albums with that famous song "everybody" knows are past behind her. Again, not a critic, it happens to everyone sooner or later, my understanding is that most of the folks here like the reunion era of Iron Maiden, but post Brave New World, what's the song that had the relative crossover success of The Wicker Man? forget Fear of the Dark or even the '80s classics, which song from Iron Maiden after The Wicker Man was bigger than that? I daresay no one, which, again, doesn't take away from the quality of the later albums, but nobody manages to churn out instant classics, setlist staples, everybody-knows-them songs for an infinite amount of time.