The reality is, some people don't want you to change or go anywhere different.
When I was in top 40 bands, I always had to learn new material and new styles.
I usually prepare a track and then I work with the artist when it's time to do the vocals.
I could easily not be the person that people know.
Commercial music, for the most part, is popular music and you always have to keep that in mind.
It might be a huge hit, it might not; but you learn something doing it.