I'd really like to see a PC game implement luck in a DCC sorta way. Too often it's just a sort of general modifier. Maybe a blobber style dungeon crawler where you can't save in the dungeon, but could burn luck points to avoid a TPK and get your ass back to town to heal. Combine that with some explicit luck checks somewhere as well (treasure table on certain chests? Chance to save/recruit X NPC? Have an inversion where low luck nets you a bonus) and you could have an actual fun dynamic with how to use your luck attribute in a CRPG.
