I don't need to do anything to connect to my providers public networks. The keys are (I'm guessing) just stored in the SIM card and I'm automatically connected when there is WiFi available. LTE being super fast and all, I don't mind not using my data plan and having a low latency, high bandwidth connection without even lifting a finger.

You also seem to overestimate how many people can afford a data plan like we (probably) have. Or just young people. Or people who don't use the Internet that often at all. It is probably not ment for the average HN-reader.