Just quoting a post from a previous thread which might help shed some light on this.
I'm just pointing out that the rules expressly state that we are to look from a weapons point of view to see if it can fire at a target. Intervening terrain can block LoS
if it's big/high enough.
The rules for seeing 10cm into terrain are there to aid in area terrain (like woods/jungles ruins etc) to give some realism and clarification and to allow us to use a piece of felt with a tree on it to represent a forest.
Everything I read in the rules leads to TLoS being the original intention of the writers:
1.8.4 Terrain Effects wrote:
Hills: Units on hills will benefit from better lines of sight to enemy units, as they will be high enough to see over some terrain features (see 1.9.2 Line of Fire). This aside, units on hills count as being in open ground (or whatever other type of terrain they occupy that is also on the hill, such as roads, woods or buildings).
1.9.2 Line of Fire wrote:
Weapons higher up can often see over any terrain that is lower down.
Weapons higher up, for example weapons on a titan.
DESIGN CONCEPT - Shooting Conventions wrote:
The following principles apply to shooting:
Measuring Ranges: You must decide with your opponent how you will measure the range between two models during a game. The method used by the author (and the default you should use if you can’t agree to an alternative) is that a weapon is in range if any bit of the attacking weapon is within range of any part of the target model (or at least one of the models on a target stand).
Lines of Fire: In Epic, the terrain and the models are assumed to be the same scale, so if you want to check a difficult line of sight between two units, all you need to do is bend over and get a ’model’s eye view’ to see if they are in each others line of fire.
The last part of the Design Concept pretty much says it all.
I have no problem with playing terrain by any rules that a considered best if I'm playing anywhere else around the world.
However, it does seem that there have been a few assumptions made about terrain that are not strictly speaking, part of the Epic Armageddon rule book.