In game terms, a hidden unit represents that the enemy knows that something is there, but can’t actually see it, so I agree with all that was said above. Overall, hidden units in buildings can cause issues during game play because how the rules address this situation. The idea of just using the “hidden” modifier is a good workable solution, and even the more simple “…you never get better than a 7+ to hit hidden units” makes for a good house rule.
However, why not just “Targeting Empty Buildings” as pointed out on page 126 of the 2E rule book. Players are allowed to target an empty buildings, and if a hidden unit is in that building, well, maybe it is in the building or maybe it is not in the building. Certainly, it can’t been seen as its “hidden”, so that means the building is probably empty. Problem solved. There is a building that the enemy can use against me that should be destroyed.
Yes, that means it might be easier to eliminate a hidden unit in a building by destroying the building; with a medium to heavy howitzer, not light howitzer.
Let’s hope this is resolved in 3E of the rules.
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