Jockey wheels seem like the most pointless thing to upgrade on a bike. I can see swapping out the usual grey ceramic jockey wheels for an anodized alloy one to match the look of the rest of the bike, but I can't see any possible performance related reason to do so.
Do they aid in shifting quality at all? I know that dura-ace and ultegra derailleurs use jockey wheels with bearings instead of bushings to improve durability, but they still use ceramics.
Is there any benefit of using the alloy jockey wheels?