10+ for bane and boon is a bad idea. There’s reasons the 10+ was only included for damaging.
I do understand wanting to have an easier to follow list I suppose, however, generally speaking, for banes you’d want probably on 15+, and boons somewhere on 20+.
Banes are generally easier to apply (compared to damaging attacks which scale the higher you roll) and you get the max affect by just matching the defense. For this reason at least a 15+ over is better to shoot for.
For Boons, you are punishing/taking away from those who choose to go Boon Focus. In addition, you aren’t going for a defense, and the average roll of your attribute dice allows you to meet the highest PL of your Boon, so a few advantage here and there should make it easier to hit the 10+.
20+ helps ensure it doesn’t outshine those with Boon focus, and considering for a lot of boons you still get an effect even if you roll only a 12.