I've been curious about Shirlz's decision to go back. She cites two things: she hated the baggy look, and the cambered sail required more maintenance. And she's got more experience and capability than I'll ever have.
1) In matters of aesthetic taste, there can be no arguments. If someone doesn't like the look of their home, it can really wear on them. I like the look of cambered sails and actually dislike the flat look. I've spent too many years around airplanes and jet engines to see anything but drag and inefficiency in flat foils.
2) Others have found that a camber sail doesn't necessarily lead to higher maintenance if particular steps are taken in the design.
It really would be so little effort to put some camber in. But horses for courses.