The basic point is that even if our state (USSR in 1937 or China in 2025) is technologically on par with the enemy, we must still stay as vigilant as in 1918. The enemy is backed from abroad, and it's still true for China. It's easier to destroy a factory than build it. Even if the enemy is not technologically superior anymore, their agents can wreck havoc without being numerous.
All the good countries like the AES states, Burkina Faso, Mali and Niger must remember that. Is this work useful for us in capitalist countries? Yes