Those flaws would require a complete rebuild though.
Look at how the legs stow in fighter mode on the 27 and then compare it to the 25. The 27 is correct, the 25 is wrong. And because it's wrong, once the armor is attached it stresses the hinges all along the back plate/wing glove causing them to crack and fail.
Minor things like a collapsible shield, using jewel inserts instead of painting sensors, etc would be easy to fix but that doesn't address the real problems with the 25 design.