>>212912051 (OP)one see the enemy and fire based on that, one doesnt see the enemy and fire based on what others see. also the trajectory of the round, if you see him make it flat and hit him face on, if you dont see him make it ballistic so it can go over mountains and do proximity detonation or ground penetration from above. a bit overlap there, both can do both to some extend. even old bofors coastal artillery in norway was atleast when i served the worst enemy of any armor formation as long as it was within their reach (26km) and had a good spotter.
thats why the coastal fortesses of norway had air defence and local defence but no tanks or artillery, the main battery was the most precice artillery you could ever get.