Lindsey has been quite prolific these past 10 years, and the quality of his output has been pretty consistently strong.
Unfortunately, I do think Stevie has trouble writing songs these days. She has implied this in a few interviews, saying she doesn't write as much as she used to. I also think she doesn't see the need to write. She thinks it's a waste of time because nobody is going to buy her music anyway. That's an unfortunate attitude, but it's where she's at now. I try not to fault her too much; she has an amazing legacy..... But as a fan I wish she'd write some new stuff before it's too late.