Thanks for your kind words, Jon.
LHS wasn't invisible to guns but it did depend where they were deployed. As the map here shows
https://www.nam.ac.uk/explore/battle-waterloothere's a small ridge right in front of it where the French actually posted a couple of batteries, but most were on the larger ridges behind that and no doubt couldn't see LHS.
At this scale of game there is necessarily some abstraction both of units and locations, as you suggest, and of terrain. Our game portrays both ridges. We had some on the southern one that couldn't see LHS but most were well forward (where they suffered from vigorous Allied counterbattery fire) and some did soften up LHS. But they were primarily concerned about driving off the enemy guns anyway.