So... This is the "improved encounter design"?

[ovIm]

Then why did they panic change monk and viper.

Because, at least for Viper, Square Enix obviously had pretty much no confidence in their product. It was reworked not even a week after release.
As for Monk, I cannot say. Guess the 4 people that work on classes are either overworked, creatively bankrupt, sick of the 120s mold, or any combination of those.