I have noticed that the AI almost never uses it.
In a corps vs corps engagement, all my artillery groups can fire at enemy troops with impunity. Additionally, any enemy guns that need to be silenced have to be manually targeted.
As a result, I could neutralize enemy artillery while the enemy isn't shooting any my guns.
Also, some artillery groups are misidentified as other types of units despite that they are bombarding at that moment. Additionally, bombardment isn't displayed as task, so there are units that are bombarding that need to be clicked on to learn that they are bombarding instead of simply checking which unit is bombarding by displaying tasks.
Without social solidarity manifested in the form of welfare state, people inhabiting one territory are a non-nation of mortal enemies engaged in competition for survival.