At least a 6++ makes more sense than +1A
I'd have to disagree with that too. Just having a sword and shield shouldn't give you the kind of surety of protection magic gives you, and I can't fathom any reasoning that might suggest it should.
If you're holding a shield in one hand, the sword in the other now can't be brushed aside by a stronger opponent? A sword can't break, and somehow can stop a manticore simply ripping your head off? A parry is when you stop an incoming sword with your own sword. You can't parry a charging rhinoceros. Swords and boards don't create magical forcefields around their bearer.
Parry should already be represented adequately by the whole ws v ws . If you rolled to hit and missed, it's cos your target dodged, ducked, parried whatever. It doesn't need an extra rule to represent it.
What on earth is this parry save actually supposed to represent? Nothing ever experienced by an actual real life swordsman that's for sure.