2d6 ± d6s, Does It Throw the Math Off That Much?
If you've been introduced to wargames, you might be familiar with Trench Crusade, which uses a 2d6 system vs a range of successful/unsuccessful results which at the surface level look similar to PbtA style games.
One thing it does it instead of flat modifiets +2 to -3, it has character attributes which add additional d6s. Always adding more dice, but the positive/negative effect of the additional dice decides whether you keep the highest 2d6 or the lowest 2d6 from the pool.
Have any PbtA games done this?
At a glance, the math makes it seem like with ±1d6, it's fine, but ±2d6 and ±3d6 make the character exageratedly much better and much worse than their normal "static modifier" counterparts in normal pbta games.