[Enternal]

The engine with low power but high sensitivity allows the user to move in the direction that they wanted without a sudden overshooting of the movement. Fits with the way the Japanese were fighting against the BETAs. If the unit have high sensitivity with high output, if the pilot wants to move 1 inch, the unit end up moving 100 inch. Not what he had in mind. Instead, the pilot move one inch, the lower output of the engine also make the unit move one inch. At least... that's what I think.

When Yuuya explains the "weaknesses" of the units, it shows that he was able to find out but those weakness are inherent due to the fighting style of the Japanese. Which is why Yui would respond that the other Imperial trainee could handle it because that's how they fight. Yuuya disagree which Yui then in way imply that although Yuuya found out the weaknesses of the unit, he still haven't figure out why they are there and in a bigger picture, still haven't change his mindset to that of the Japanese when piloting these units just like his friend had said so before. Which is pretty clear in how he wasn't able to fight well compared to the others who tried to understand the units and how the Japanese fight in them.

It's like using a handgun and pointing out that a handgun is low power, does not have high accuracy, and can't shoot far but then continue to use it as if it's a sniper rifle. Those are inherit weaknesses of a handgun as it is not meant for long distance high powered shot. In this case, Yuuya figured out the inherent weaknesses but still haven't found out why and how the unit is to be used. His friend was very right. "You need to have the mindset of the Japanese to use these units due to how they think and fight in them".