I approve it. Here is an idea:
I wonder how the war mechanics would work if we could choose between different types of 'Fortify', for example:
- Increase 5 resistance points, or
- Increase damage to the opponent (15% cumulative for every fortify, up to say 75%), or
- Reduce loot from ground attacks (15% for every fortification, up to 75%), or
- Increase own ground, air or navy efficiency by 25% (smaller nations could use it in a way to better resist down declares and create fairness - in exchange they lose 3 MAPs fortifying)
... and other options.
I think it would create an interesting complexity to war and strategies. It would enable different strategies, defensive or offensive.