★ Edit in response: Only some of the same problems are being solved. If the USPS let everyone choose an ID, it wouldn’t be long before websites let (US) customers enter “tcollins12” instead of “Tom Collins, 145 Main St., Somewhere, ST 12345” during checkout… it wouldn’t be long before your public wishlist said “ship it to USPS address ‘alanh’” without giving away your residence… it’s not just an alias, it’s a paradigm shift. (With the UPS offering you linked, your address still takes the form of an address.)