I ask because I came across this:
"Strength gives a large amount of parry now. Using a Fine/Guardian's instead of a Skillful/Sovereign give you about 80 more parry rating per gem, which is on the order of .01% extra chance to parry. That is... completely underwhelming. Although AP from strength doesn't contribute to SBar on its own, the 5% extra AP from strength given by our Battle Shout does contribute to SBar. Per gem, we get about 32 extra damage reduction on a 60 rage SBar while also getting a very comparative amount of parry. In the end, the difference lies in its effect upon your damage output. Parry rating gives you nothing, strength gives you a little bit more. Is the difference world-ending? Nope, but the greater benefit across the board will come from the strength gems."
Is this math just incorrect? I assume the dancing steel versus rivers song question is similar.