The case of the ever-shrinking D score. In the last decade, the Yurchenko 1.5 has gone from being among the most common vaults—even medal-contending teams would consider using it in a team final, and second-tier countries would add a gymnast to a team specifically for a good Y1.5—to the elite scrap pile.
This is partly due to the increasing expectations of difficulty and partly due to the 2009 value downgrade, valuing it just three tenths more than the far easier Yfull. Why do a 1.5 when you can do a full and guarantee scoring better? Currently, the Y1.5 is worth four tenths more than the full, but it’s still a scenario where the execution deductions outweigh the difficulty advantage. Many will elect to progress straight from the full to the double full.