Originally Posted by
Merrus
To accurately compare BUILDS, you must assume the same weapon for both builds, so lets do that. Your Str build will have 36 strength and your Dex build will have 29 strength (28 for damage purposes). That's a difference of 8 strength and 4 damage per hit.
You are ignoring "to hit" and assuming every hit is a critical, so lets do that.
With Rapiers that difference is 8 damage per crit, times 6 attacks per round, which is a difference of 48 damage per round.
With Kopeshes that difference is 12 damage per crit times 6 attacks per round, which is a difference of 72 damage per round.
So, with your assumptions of always hitting, and all hits being critical hits, the difference between the two BUILDS is 72 damage per round with Kopeshes or 48 with Rapiers. This is significant, but it is a lot less than 216.
Now lets compare the Dex build with Rapier to the Str build with Kopesh. Using your formula, that computes to 45 for the Dex build with Rapier and 82.5 for the Str build with Kopesh, for a total difference of 225 damage per 6 attack round. That is indeed impressive, and demonstrates the potential of the higher crit multiplier of the Kopesh, however ...
... lets remove your assumption of every hit being a critical, which seems more realistic, then the higher crit rate of the Rapier will narrow the difference. Also, the additional strength, and resulting damage, of rage, ring, and madstone emphasizes the difference, but may not be available to any given player/character. Removing one or more of these narrows the difference as well. Your example does a good job of showing the POTENTIAL (damage) advantage of a strength build with Kopesh, but the actual difference could be somewhat less for any given character. So, the superiority of the strength BUILD with Kopeshes may not be as dramatic as you think, for every player/character.
Also, a strength build (halfling) starting at 16 strength would require a sacrifice of points in dexterity and constitution or intelligence, and/or require a +2 tome to meet the 17 dex requirement for the Two Weapon Fighting feats. Not everyone is willing to make that sacrifice. It does appear that a strength build, using Kopeshes, may have superior damage potential, but at what price? Maybe a player doesn't play much and can't afford the "good" Kopeshes, and opts for the wider (and cheaper) weapon choices of a finess build, or values other stats over the additional damage from strength, or values "to hit" over damage while they are acquiring that uber gear.
For many of us there is more to consider when building a character than merely maximizing damage.