We have strong cryptography and near-instant communication protocols. Why the hell is there a postal service in every country, and why is the quality of the postal service an indication of sophistication rather than lack of development in a country?
> Why the hell is there a postal service in every country
Because delivery of packages to rural areas is terribly unprofitable.
Certain things need to be socialized in order to keep a country connected and enable development.
Without things like the post office, rural electrification, and the Eisenhower Interstate system, vast swatches of the US would have zero economic output.
I'm not sure if this is meant to be rhetorical? Either way - ideally you have postal service AND electronic communication, and the quality of both reflect on the country.
It's a fair question though - anecdotally, the two main uses for the postal service nowadays (in countries with internet access) are package deliveries and unsolicited marketing (possibly print subscriptions factor in).
To my mind, the unique advantage of the Muggle postal service for personal communications, apart from the globally federated physical distribution network - the one that would make me very hesitant to scrap it - is the difficulty of conducting mass surveillance on it.
