I would like the medals to have some power in the game. For example: Monsters with Bronze, Silver and Gold medals would increase the chance of getting Rare6 by 1%, 2% and 3% respectively.
Currently nothing happens with the quality of the medals acquired.
I disagree that it should affect loot tables, but I do certainly agree that medals should have some sort of reward attached for unlocking them, as in Pokémon Go. HR, common ore/bones, maybe a set one-time material bonus for each level of medal unlock - definitely not any permanent changes to the loot table though. Long term, every part is needed. You might think a higher r6 chance is a net positive, until you end up swimming with them and need dozens of lower level parts that you’ve made that much rarer for yourself.