"Simon's obcession with writing only about "relationships" makes her a bit tedious"

Yes, I would agree with that. It is the most notable shortcoming in her considerable talent for songwriting. I like her melodies, I usually like her singing and instrumental arrangements, she's written some fine pop tunes that any card-carrying "true folkie" would no doubt turn up his nose at in utter disdain (like the one for the James Bond movie)...

On the whole, a pretty good singer and songwriter, and a prolific one, as you said.

But it would be nice if she wrote about something besides personal relationships.