However, with the invention of the mirror effect, the question of how "fair" the engine itself is has become less relevant, as the mirror effect makes any engine fair. I'm not sure how morale/luck works with the mirror effect now, but Wizard promised to make it so that it drops equally from the top and bottom (as much as possible).
Yes, I agree – perhaps HotA with the mirror effect, where everything, including the drop rate of morale, is synchronized, is simply a dream.