Looking at her singles page on wikipedia (suspect source, but i don't know of a better one), looks like she's had 11 singles hit number 1 on billboard 100, and most of them are later songs. She's had many more in the top 10. I think your theses here is a bit suspect.
Not sure why you think my thesis is suspect. She had 12 number one singles, and they all had different writers. Those are just facts that you can easily verify.
My point is that "artists" are huge teams of people. Here are the credits for Swift's top 12 hits. Of course I wasn't in the room for the writing of any of these, but the diverstiy of the team involved is at least notable, yeah?
"We Are Never Ever Getting Back Together" (2012): Taylor Swift, Max Martin, Shellback
"Shake It Off" (2014): Taylor Swift, Max Martin, Shellback
"Blank Space" (2014): Taylor Swift, Max Martin, Shellback
"Bad Blood" (featuring Kendrick Lamar) (2015): Taylor Swift, Kendrick Lamar, Max Martin, Shellback
"Look What You Made Me Do" (2017): Taylor Swift, Jack Antonoff, Richard Fairbrass, Fred Fairbrass, Rob Manzoli
"Cardigan" (2020): Taylor Swift, Aaron Dessner
"Willow" (2020): Taylor Swift, Aaron Dessner
"All Too Well (10 Minute Version) (Taylor's Version)" (2021): Taylor Swift, Liz Rose
"Anti-Hero" (2022): Taylor Swift, Jack Antonoff
"Cruel Summer" (2023): Taylor Swift, Jack Antonoff, St. Vincent
"Is It Over Now? (Taylor's Version)" (2023): Taylor Swift, Jack Antonoff
"Fortnight" (featuring Post Malone) (2024): Taylor Swift, Post Malone, Jack Antonoff
https://en.wikipedia.org/wiki/Taylor_Swift_singles_discograp...