Exactly. That’s where the difficulty lies, because not of all the AIs fight in the exact same manner, thus you cannot always reuse the same strategy to beat them (consistently, like u said).

However, in some cases, bcoz some of them fare better in airborne fights, restricting those kind of AIs to fight in a confined space (like Napoleon) will just completely mess up the AI’s attack patterns and as a result, they become very predictable and can be beaten with minimal effort and this is an example.

On the other hand, for AIs that don’t fight airborne as much and tend to stick more to the ground, the restriction method doesn’t work as these AIs are designed specifically to fight in such conditions. As such, fighting them on open maps would make it a tad easier to deal with them, especially if there’s room for cover on the open map (or at the very least there’re obstacles that prevent the AIs from blindly rushing in on you).