Well, now i got ur point. Artists always run the risk to become repetitive. it's s easy to get stuck, BUT, FORTUNATELY, AYU DOESN'T DISAPPOINT US!!!
(Well, at least me
) the summer songs in summer was becoming a boring routine, but thankfully she brought and amazing song in winter instead (Green) which meant a new direction in her ballads. Now, with rule/sparkle she is again going in a new direction.
She already showed interest in rock/metal in talkin' 2 myself, but now, she went one step beyond and created a heavier song with Rule, which turned out to be an amazing song in terms of music and lyrics (i'm a heavy metal fan) plus, she is trying go forward giving herself a chance to experiment with her voice.
Other songs that i consider refreshing are M, connected, bold & delicious,Will, never ever and criminal.