Stats that have broader effects.
For instance a forgeborn rogue doesn't get anything from the bonus str as it effects weapons that they don't use.
AdminDerek (Manager, 10x10 Room) commented
Strength does have some other effects: it helps characters recover from the restrained condition and resist some special abilities that involve grappling or shoving. Other stats help with recovery and resistance in different situations too. In addition, some decision points in quests have choices that are only unlocked if a character has a particular stat at a high level.
We do plan to introduce other ways for stats to matter in the game, though.