So we would still have to rely on encryption. The system is now more complicated for the benefit of saving a few CPU cycles and allowing everyone to read the c

So we would still have to rely on encryption. The system is now more complicated for the benefit of saving a few CPU cycles and allowing everyone to read the content of the message. When we tend to have plenty of CPU cycles to spare this trade off looks like a loss even not counting privacy as a virtue in and of itself.