NO. I'm not agree again.
First of all, I don't have 2 rims to ride in wet "Grind" and in dry "Smooth".
Moreover, for me, brake holds better with grind rim in all conditions, wet and dry.
I'm agree with you that tar in wet conditions it turns like lube but in dry conditions grind with tar it's the best choice.
Obviously in wet conditions you don't have to put tar.
And now we can continue speaking about the bike, I don't want ruin the topic speaking about tar.