There is no WW2 basis for the artillery system as implemented in RO.
We have a game that revels in the complexity of loading and aiming a bolt action rifle or a throwing a hand grenade, but grossly exagerates the ease of calling in artillery and the leathality of the artillery when it is called.
Exactly, hit the nail on the head. Grid map would be 200% better. And it would be easy to implement right? I mean we have an objective map already...just add a grid overlay to it and click TRPs like you click rally points!
More realistically, Arty strips the infantry from the armour in an attack.
Again, you cut right to the chase. Combat Mission simulates this very realistically. In that game, due to delays of communications for setting up a fire mission (especially for the Russians), it takes a good while to get a barrage down, not to speak of having to adjust it.
In Combat Mission, arty is used to prep areas and get infantry to dismount vehicles or seek cover. You don't have the time to spot every individual tank. If you did this, the round would be over and all the vehicles would have moved by the time you adjusted exactly to the spot. Arty is for infantry and saturating areas. AT guns and AFV are for taking out tanks.
This reflects real life. I have read of historical cases where arty was used to take out tanks, such as in
Tigers in Combat by Wolfgang Schneider. However, it is important to note that this was very rare. This book lists EVERY action that the heavy tank battalions (besides those of the SS, which is going to be in another volume) were involved in, along with the fates of every tank. Out of all the Tigers destroyed, only a couple cases are listed as being due to arty. At that, it was when they had become bogged and were stationary for hours on end. Only after all this time did the Russians call in some arty and destroy the tank. It was not something that Russian infantry could call up on within a minute's notice.
In RO, for such a small group of infantry operating, they have pretty large arty resources, and it is exceptionally responsive. No way at the platoon or even company level you would get arty this responsive or plentiful, especially if they were large caliber guns that were divisional assets.