The main problem is that the change of Low Morale also applies in High Morale, which makes the difficulty unbalanced when Duplicant Mood is at a difficult option.
If I want to have a challenge and choose all the most difficult options (with Low Morale (Very Hard)) , it will be easy because once I improve the morale over the expectation, it will have a bonus, -50% stress per cycle at most.
If I choose Low Morale (Easy) , it will be difficult because High Morale bonus can not neutralize the effect of Fatalistic as the bonus is -13% at most.
Steps to Reproduce
Choose Low Morale easy or hard at the same time choose Fatalistic
This issue has not been confirmed by a developer yet.