@otmar That "phone systems were real physical things" also meant that wiretaps were real physical things, with non-trivial expenses for each individual tap, meaning it had to be used sparingly. But with modern computing, governments (and private companies) can (and do) afford indiscriminate mass surveillance of all citizens, violating the social contract under which unencrypted communication was an acceptable default. E2EE is becoming mainstream largely in response to this government overreach.