Imagine if they added realistic weather.
There are some clouds flying above the map and if you zoom out enough you couldn't see through them. You wouldn;t see raiders coming under the cloud if you were fully zommed out
If it is raining over a farm then it restores some food in it or if it hailed over they would lose some food.
There is a storm coming and if a lighning strike hits a unit it dies or hit a building and it takes damage.