First, I want to point out that predictable AI is actually a big part of what makes this game fun. Think of fights that involve more chaotic things such as heros with big single target nukes, or 'dispel'. These fights are generally less fun. I think having consistent AI will generally be for the best.
Second, the Ai behavior effects the quality of certain abilities. In KBAP, most enemies would avoid Mystic Eggs in favor of real units, making the spell particularly strong. If enemies prioritized it, it would be much weaker. We cannot evaluate AI behavior solely on what 'makes sense' for the unit, as much as how balanced it makes all abilities.
Another good example of that, is that in previous games, ranged units would occasionally not move and then shoot, to deal more damage with less risk. They'd just randomly decide to melee. This behavior made them a lot weaker than they otherwise could be.
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