why is she always downgrading atm though?
A Thousand Miles is a blessing and a curse for Vanessa all at the same time. Naturally she understands that it was the cornerstone for her career, and put her in the spotlight. But she can never escape it. Even now when doing radio promotion for Nolita Fairytale she's still playing A Thousand Miles so people will recognize that it's her. So sure, the song did wonders for her, and she wouldn't be where she is today without it, but she's stuck playing that song for the rest of her goddamn career.
Try to understand how she feels as an artist in regards to that song. It's not a diss against us as fans who came to love her because of that song. She's just trying to move on.
The destruction of the piano and and mimicking of the ATM video in the begining of the song is symbolic of her trying to put ATM behind her. She doesn't want to be known as just the "ATM Girl" anymore. But you all know that already.