The really significant change would be that agreeing in one dimension (yes A is better quality than B, but we disagree on which is more rewatchable) still contributes to your correlation with someone. We're not doing that at the moment, because it felt like pairwise partial agreement would weaken the signal - I wanted _real_ agreement (in both dimensions) to stand out.
While there might be a way to capture that with a linear function, I've favoured solutions that reflect that our ratings are two-dimensional.