Speaking of the Army of Chaos, one of my favorite additions in Just Cause 4 is the front line mechanic. Additionally, military bases and towns are more unique as well, with each one featuring different types of objectives to complete in order to allow your army to move in and take control. Fortunately, Avalanche Studios took a page out of Just Cause 2's book for Just Cause 4 and reintroduced biomes to the franchise, including rainforest, desert, alpine, and snow, as well as the return of grassy plains.
On top of this, each area that you had to clear was filled with the same exact objectives, which lead to a feeling of staleness and repetitiveness as you liberated Medici.
One of the biggest disappointments about Just Cause 3 was that there was only one type of environment: grass plains. The world of Just Cause 4 is expansive, diverse, and deep.