I agree, but even the most sophisticated or rusty/bent/damage drivetrain is only unridable if a chain-link is broken and you don't have a chain-link tool to sho

I agree, but even the most sophisticated or rusty/bent/damage drivetrain is only unridable if a chain-link is broken and you don't have a chain-link tool to shorten it. Even with broken cables, you can select a gear by moving the chain and go forward.