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Played the second mission on normal difficulty for Haven using auto-battle – I was disappointed.
1: No experience is gained for the Legacy.
2: I replayed major battles, but not minor ones.
3: After conducting many consecutive battles with auto-battle, even though it showed me small losses, I later noticed that I had almost no army left. That is, I wasn't in control; when I fought manually, I could go far on the map with a small army, but here I had to return for reinforcements.
4: For the first time in all the missions I've completed, I received a lower veteran rank. Previously, the lowest rank I received was veteran. It feels like with auto-battle, you not only lose Legacy experience but also your mission completion rank decreases.
5: You start to relax and become less focused after frequent auto-battles (this is about myself).