Did you miss this.Why. That would just make them worse not better. Since now they can just role to attack the the target behind cover and not have to add on the DM-2 to the roll
“ "Rule 34: Meson Accelerators
Battlefield meson accelerators are introduced at tech level 15. Although technically a direct fire weapon (the beam travels in a straight line), a meson gun's ability to fire through intervening obstacles and the need to know the distance to target makes it functionally an indirect fire weapon.
Meson accelerators follow the same rules as other indirect fire weapons "”they already use the artillery rules