The key thing is something you touched on. If the gunner is good. That comes with practice, experience, and familiarity of his equipment. That triad of factors is something that not all mortarmen HAVE the luxury of. You can gun drill all day but until you actually lay it in, hang rounds, and see where you might be making mistakes you're not going to gain a full understanding and respect for what you are working with and it's capacity for downrange effects.
Us 11B's have day sights, night sights, nvg's, lasers, illuminators, iron sights, new buttstocks, new tripods, new entire weapons systems... yet we neglect the most indigenous and powerful weapons system we can more often than not YELL at, not call over the radio, YELL at to do fire missions...
I got to see our Bn's mortar section in action moving to cover us during some of our operations we did. I got to see them throwing rounds for registration and actual fires with the 120's, 81's and 60's. The capability is significant! There's something to be said about the lack of exposure and basically "effective marketing" of capability of the mortar team in general.
Especially in the concept of "cost of war". You want to save money in combat? Stop the fucking "sexy airstrike" shit and pass out the goddamn 60's, 81's and 120's. Trust the guys because they can accomplish the mission. I won't discount what an A-10 can do, but here we are making "small diameter bombs" when we already have the specific capability to apply the same style of effects....indigenously to infantry units. Not over a radio when command, fuel, weather, pilot rest time, and everything else including the planets aligns, but right fucking now they're on shift with rounds ready.