I may well have misuderstood the first of your 3 posts there, but it looks strongly like nonsense- sure, a bonus here or there may not make it quicker every time to kill a monster, and granted the bonusses are small (at least at heroic).
But the idea of needing X number of rounds of average damage to kill a monster, and therefore extra DPR being wasted, is rubbish- DPR is average, so actual ddamage can be quite a lot more or less. Also you are acting with a whole party, who all have different hit rates and damage rates.
Therefore it's really meaningless to say that you won't drop a monster quicker because of a small increase in DPR- this is a bizarre abstraction. Sometimes it will make little difference, but on average, by increasing DPR by any amount, you will reduce the time taken to kill a monster. Optimised players increase their DPR by a greater amount with either Expertise of Focus, and therefore will kill a monster even quicker, a greater relative increase in DPR and relatively more improvement in the time it takes to kill a monster.
Granted expertise will only actually make a concrete difference every so often. But when it does (about every other encounter at heroic, the way my group plays), you will have just landed one more hit. That could easily lead to taking down a monster one round quicker, or even more.
But the fact remains, than on average you will take down the monsters slightly more quickly, and the improvement for optimised players is absolutely greater than for those that are not optimised.
But the idea of needing X number of rounds of average damage to kill a monster, and therefore extra DPR being wasted, is rubbish- DPR is average, so actual ddamage can be quite a lot more or less. Also you are acting with a whole party, who all have different hit rates and damage rates.
Therefore it's really meaningless to say that you won't drop a monster quicker because of a small increase in DPR- this is a bizarre abstraction. Sometimes it will make little difference, but on average, by increasing DPR by any amount, you will reduce the time taken to kill a monster. Optimised players increase their DPR by a greater amount with either Expertise of Focus, and therefore will kill a monster even quicker, a greater relative increase in DPR and relatively more improvement in the time it takes to kill a monster.
Granted expertise will only actually make a concrete difference every so often. But when it does (about every other encounter at heroic, the way my group plays), you will have just landed one more hit. That could easily lead to taking down a monster one round quicker, or even more.
But the fact remains, than on average you will take down the monsters slightly more quickly, and the improvement for optimised players is absolutely greater than for those that are not optimised.