Board Thread:Questions and Answers/@comment-24955097-20140518204407/@comment-6697950-20140730191555

STR only affects what kind of weapons you can carry. It does not affect damage dealt directly, but it does indirectly as C9 stated.

A-1 is known to be lazy. The Kagemitsu stats seemed to be copied from some pistol, since the Kagemitsu is a one-hit kill kind of weapon, unless you only scratch your opponent's limbs or something.

And for your comment about her build, here's a quote:

Though Sinon's class as a «Sniper» was extremely rare, it was one of these. To equip a large-sized sniper rifle, they have to strengthen their STR status, and then have to increase their DEX to improve their accuracy, and finally a suitable amount of AGI to get away quickly from the scene after a snipe. However, they would lose if they were discovered, so they gave up on VIT completely

Sinon has no use in VIT, since a sniper is not suitable for close range battles. Her strategy isn't to "dodge", it is to "kill before the opponent gets too close". That's why she only snipes a target if she is sure that she can hit him or if she has backup to draw fire. That's why I don't see the point in categorising builds by defense. The characters categorise it by stats.