That's most certainly not what I described. And what I described is how they actually work IRL = what would be considered a "pure" mechanic, which is what you and I were discussing here, not how boring or fun this or that approach is.
Btw, absolutely not how indirect fire works "in real life." Mortar crew is nowhere near the fight and almost never observes their own rounds. Instead, the squad in contact is calling for support. First couple rounds will be way off unless the observer is very good, but they'd slowly bracket until they were close, then observer would call for a barrage that's made without adjustments. The variance in those rounds is based on manufacturer tolerances in the mortar tube and ammunition and any crew inconsistencies. The game actually models this part fairly accurately.