Glove weight increase (especially lighter gloves), IF change, and powerful/heavy weapon improvements were a few countermeasures against agi builds becoming too OP, at least in keeping the wpf differences between builds somewhat compact unless agi builds give up more durability. No doubt that they're still great, but some may feel a bit frail at times or believe that they may utilize their armor more effectively with +3 strength and -3 agi.
I think it's good to say that you should adjust your strength to the amount of armour you're going to wear. 15-21 strength for medium-light armor, 21-24 for medium, 24-27 for medium-heavy, and 30+ for plate, assuming decent IF levels.