A common trend in new PbtA designs is to use an Advantage/Disadvantage mechanic (as seen in D&D 5e) over additive/subtractive modifiers. Here is what that would do to Dungeon World, mathematically speaking. [Edit: The chart represents your chance to get a 7+, 10+, or 12+. Sorry. I should have made that clear.]
Originally shared by Ray Otus
What happens when you replace +1 with an “advantage” roll in PbtA games?
Then answer is that you are about 8% more likely to hit a 7 or 10 than you were with just a +1. However, you are 1% less likely to hit 12.
[Math courtesy of AnyDice.com. “Advantage” means rolling 3d6 and taking the two best numbers.]