The concept that software and hardware vendors have purposely installed backdoors into their products is widely held.
Whether this is in fact the case or there is just the wholesale exploitation of the inevitable software vulnerabilities that will exist on all platforms it really amounts to the same outcome. Security Agencies and criminals will have, or claim to have, access to equipment and communications networks that those that make them claim are "secure". This creates a dichotomy in that both cannot be true in all circumstances.
The KISS principle
As communications get more and more complex, and this is always relative, there is merit in keeping your activities simple if you want to be "safe".