@sinker: I already explained how in some situations weapon rating and accuracy are identical. If you want to say that accuracy is always better, you're going to need to disprove what I said somehow.
It's already been done. I'll try to simplify.
1. Comparing accuracy to weapon rating at a 1:1 ratio.
2. Measuring by stress caused.
3. Accuracy past the success level becomes stress at a 1:1 ratio.
4. Weapon rating becomes stress at 1:1 if accuracy is high enough.
Conclusion 1: Accuracy is a must. If you don't hit, weapon rating doesn't matter.
Conclusion 2: Excess accuracy is equal to weapon rating in causing stress.
Example: Splitting 10 points between accuracy and weapon power evenly makes me ineffective against anything with a defense greater than 5. If Defense is exactly 5 I'll cause 5 stress. Putting all 10 points in accuracy means I'll still do 5 stress when defense is 5 but I'll also do 4 stress when defense is 6 and 1 stress when defense is 9 - both situations where the 5/5 split does zero stress.
Hopefully that's clear. If not, please let me know which part isn't understandable and I'll try to explain.