And my point is that piano and FS are different kind of competitions. At your examples, judges are scoring the execution of pieces of music or composers. In FS they creat the programs. If it was similar, in 2002 ISU would banned New programs, to create competitions to evaluate execution of Yagudin programs, Midori programs, or any established programs. What is the point to creat programs if they are only interested in the execution?
Well, the point is certainly not to show artistic growth or challenge from year to year. Such considerations have never ever been part of the skating scoring.
Earlier in skating history, it was pretty common for skaters to use the same music for many years and to go back to their favorite music in Olympic years.
Reasons for skaters to choose new music:
*They're tired of listening to same music every day in practice for multiple years or have negative associations with a programs they were unsuccessful with
*They need to change the program length anyway as they move up to new levels of competition (before they reach senior level) or when rules about program length change
*They need significantly different choreography as short program requirements (or well-balanced program requirements, or IJS levels) change
*They have mastered new technical skills and need new choreography designed to showcase the harder jumps or more complex transitions, etc.
*They have mastered new presentation skills and want to show judges that they are now more mature or more artistic than their last program was designed to show
*Their coach thinks that a new style of program will stretch them to master new presentation skills, which they don't have yet when the new music is chosen
*They like to entertain audiences and think that new programs will increase the entertainment value for repeat viewers
*They have aspirations of creating art and like to stretch themselves artistically
Of course we could also make a similar list of reasons to keep last year's programs or resurrect an old one.
Different skaters may have different reasons for their decisions -- and the same skater may have different reasons for keeping or reusing different programs in the same year or for year to year.
There isn't one right answer.
If they were competing in a multi-year versatility competition, then showing new work each year would be important. But that's not what the sport is about.
I think choreographing at least one new program each year started to become more common in the 1990s for several reasons:
*More time to focus on freestyle once school figures were gone (for singles skaters)
*The rise of "skating choreographer" as a profession
*Skaters finally allowed to earn money through skating-related endeavors
*More opportunities to compete each year
*More occasions for those competitions to be seen by more viewers on television and online