I still think OKW has the best Theoretical Design since it perfectly encapsulates the spirit of late Wehrmacht army: very experienced veterans with little technical means so scavenging becomes really important.
If the bonus were, say, 40fuel and 90muni it would be way better since it actually makes sense to risk your squad's life for faster tank production. In its current iteration, it's meaningless.
I agree to some extent, but the application is lacking. I feel like it would have been better if scavenging helped unlock upgrades. The original P4J, when it came as a part of a 2-pack had horrible turret rotation. It would have been cool if scavenging unlocked a turret upgrade so it felt worth it to risk infantry while making it vital to destroy wrecks to keep it out of OKW hands.