Damp the response, damp the effectiveness. It's inherent to the physics of the system, which was designed specifically for use by Spartans. The UNSC has rolled out a retrofit that can be worn by people without Spartan training and enhancements, but it's just not as responsive. With the UP's tech, you could design something with similar effects, but it wouldn't be the Mjolnir platform.

[She doesn't really care if other people have power armor. It's just that Mjolnir itself isn't feasible for anyone who isn't trained from childhood for it.]

Freelancer's a failed experiment. We had a lot of those during the war.