Acts 1, 2, and 4 monster density will be receiving some adjustments in the patch 1.08，Blizzard try to make all of the acts as comparable as possible so that players don’t feel they always have to farm the same areas of the game repeatedly, But now they worry about that will possible inadvertently create an “optimal” route.
Currently the developers have a situation where a small number of specific runs are twice (or more) as effective as your average run. This margin is too large and overshadows other factors. their goal is to make the monster density in Inferno close enough that factors such as your skill choices and gear level start to become more relevant. Let’s suppose you were trying to optimize XP/hour. What if a cookie-cutter Archon build on MP1 had one optimal run, but an SNS Wizard on MP3 had a different optimal run? Different areas also have different monsters with different abilities. Some classes have an easier time dealing with particular monster types, this can cause the “optimal run” to shift as well. If they get the overall densities closer, these other factors will start to become more relevant rather than the current situation where the raw monster density of a run dominates all other factors, The developers are trying to create variety of different game environment options for players .
When things are close enough, you may try a run that is a little less XP/hour if it means increased Demonic Essences. Maybe you just really enjoy the art of the Act I jail. Maybe you just want some variety and haven’t been to an area in a while. Maybe you want to do a full play through in co-op with a friend. It’s a matter of degree — these aren’t tradeoffs most players would make when the run results in a 50% loss in efficiency, but if the difference is 5-15% then these other factors come into consideration. So, like Lylirra said, Blizzard`s goal is to avoid creating a new “most optional” run, and instead provide players with an environment that allows them to choose from multiple different options.
For more information you can visit the official site.