It occurs to me that open rolls are mostly a thing because it’s fun to roll dice, and character sheets are a thing because players like to optimise. It’s be fun to have a system where the rolls and player stats are hidden information and the players only have perception of how good their character is at stuff from the outcomes of their choices - like you can have a full-on Dunning Kruger wizard in your party, or be totally unaware that your barbarian has an innate skill for music.