Prior to adding 30 seconds, a huge portion of the war community was staying at TH9 because it was perfectly balanced. These people did complain about the added time - it completely ruined the competitive war scene at this town hall level. One thing it did do, however, is make the war scene at TH10 competitive. 3 stars were actually possible, although still very difficult.
What I actually find to be comical is that, after the 30 seconds was added, many TH9's upgraded to TH10 because it appeared that may be the new "sweet spot" for war. Now that we are reverting back to a 3 minute time limit, TH9 will once again be great for wars, and TH10 will be even more imbalanced than it was before.
It's all about perspective - this change is great for TH9's and below and horrible for TH10's & Th11's. Ideally they would only reduce the timer for TH9's and below.

