Security is a spectrum. The only way to ensure security in communications is not to communicate. Also every improvement in security comes at a cost and even whe

Security is a spectrum. The only way to ensure security in communications is not to communicate. Also every improvement in security comes at a cost and even when it's "obvious" the security feature is worthwhile people's experience of the feature may be different. Spoofing and eavesdropping can be fatal but in a lot of ways "I can't communicate with this person" is the biggest threat and all security features occasionally or frequently impair people's ability to communicate.