@barnee
The idea with Landmines is to “force” the enemy advance in another - and longer - direction on the way to their Target.
In other words - you want the enemy to see the Landmines.
Should the enemy choose to pass through the Minefield anyway - well, then there will most likely be losses…
Concerning Submarines & U-Boats - we also play tested “Hidden Subs”.
It proved to be too time consuming to register all these movements - and most often it gave the German Kriegsmarine the upper hand.
The OOB Axis & Allies games are all based on complete visual troop placement & movement. This is part of the Basic Game Mechanisms.
So we chose to follow these same mechanisms - simply because players have countless new options whit the use of the Axis & Allies Global 1940 House Rules Expansion.