Why use d12 and not a d6? With d6 the situational modifier would be, well, twice as meaningfull.
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so you wanted a bonus that didn’t do much some times. Why? What’s the point in having +1 if it would not tip the scale to your favor half the time?
I mean - would you feel good about having a +1 and rolling a 9 for it simply to be bumped up to a 10 and giving you basically nothing different? With d6 that’s never the case
as to 1 and 6 on a d6 not being the results with bonus/penalty - it is the same for 1 and 12 on a d12 with the same bonus/penalty.
I just don’t see the reason for simply doubling every number but keeping same core mechanic. What’s the big difference between a 11 and a 12 chance of hitting either one of those is the same as any number on a d6.
It depends on how you want the Oracle.
I like that it is unpredictable, that every outcome is always possible, that the modifier is a hope that things will get better, but not a certainty.
With the d6 a +1/-1 modifier eliminates the possibility of obtaining Yes and.../No and... as a result; in this case the possibility is reduced, but still possible (it lowers the probability of obtaining No and... from 16.67% to approximately 8.33%).
If you prefer to use a d6, you are welcome.