She doesn't make music based on what she thinks will sell. She makes the kind of music she wants to make, and tries to do something different/better every time. That's what she's done her whole career.
Taylor Swift - her debut, straight up twangy Country and establishing who she is as an artist and songwriter.
Fearless - A little more mainstream leaning Country, with some singer/songwriter type songs...showing maturity.
Speak Now - Writing the entire thing by herself, a Country album with variety....some Pop leaning songs, some blues leaning songs, some folky leaning songs, etc.
Red - Deciding to collaborate with a variety of different producers/songwriters and make a mix of styles including Pop, Rock, Singer/Songwriter, Country, Alt/Indie, etc.
1989 - Full on Pop album with electronic influences.
She's always just done what she wants.
It actually just shows a very slow transition to Pop ! I don't see any drastic changes from 1 album to the other.
I'm not worried about the direction of T6 after she proved us wrong with 1989. She better focus on the current era cause I literally want every MM/Shellback produced song to be released as a single.