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Once you start throwing real world combat engineering considerations into the mix, you stop building toys and construction vehicles and start designing and building lethal war machines.

Considerations like programmed autonomous drones or RC human operated machines. Then the software and code becomes the key link in how a mech reacts to threats and responds with accurate, fast, lethal force.

Defensive systems now come into consideration for survivability; you're now dealing with real world armor and active defense systems (electronic systems to jam missile lock or mask heat signatures).

High speed mobility comes into play as well, making a compromise between weight from armor and armament versus speed and maneuverability.

This is the point at which such contests become really interesting.