Artillery units do not sit on the front lines.Why is it there is no complementary anti drone or anti air support for these exercises. In real war case scenario, these artilery bombardment will probably be countered by cheap drones. As it was demonstarted in the Armenia-Azerbaijan war, heavy weaponry is blunted by just remote controlled cheap drones.
This modern combined arms warfare should be practiced more.
They sit behind friendly forces, under an air-defence umbrella which in theory should be responsible for countering enemy's "cheap drones"
If your artillery is getting bombed by your enemies cheap drones then you probably got bigger problems to worry about if your enemy can fly behind friendly lines and bomb your rear uncontested