Back to the future
In the days of COCOM, and in fact early Wassenaar, encryption was recognised as dual-use and export controlled. Banning strong e2e is just 'back to the future' and, having been there already, we know how that works out. The algorithms leak, new algorithms are created, and those who are outside of the immediate reach of the authorities roll their own. And, of course, you can always resort to a one time pad. Difficult to decrypt communications is not easy to ban unless you ban encrypted communication completely...but then you have things like steganography.