Artillery operates in batteries, and they aim to get as many rounds
in the air within the first few minutes, saturating the
targert.
Now, unless you have a huge number of these, the targert area will
be still flattened.
Although the laser may be good for defending key installations, but
due to the fact they drawn huge amount of power, they aren't
exactly portable. You need huge banks of generators to accompany
it, thus in my view, not practial on the field until they improve
the energy efficency of the laser.
So far, the best way to deal with enemy artillery is still to take
them out before they fire, and counter artillery fire.
