This is such a backwards take. You are ignoring that the system you cite as evidence that secure systems with backdoors can be designed and protected from random access has not been perfectly protected.

And you say it's stronger now.

Ok, so which country or neighbor is going to be the one to hack our national encryption system with a back door the first time? The second time? The third time? Before we manage to get it right (which we never will), what damage will be done by the backdoor? Probably something like Salt Typhoon, which you also conveniently ignore as a counterfactual to your claim.

It not being perfectly protected is by design. Security comes with trade offs.

>Before we manage to get it right (which we never will)

Keep in mind that modern encryption isn't perfect either. You can just guess the key and then decrypt a message. In practice if you make the walls high enough (requiring a ton of guesses) than it can be good enough to keep things secure.