There are plenty of packages still going through the USPS system. Plus, it's how lots of people get their medicine, where delays can really cause severe and unnecessary problems. I would rather get all my prescriptions at the pharmacy two blocks down the street from me that usually has my refills ready in under 30 minutes, but my insurance won't cover any medicines I need to take long-term unless I have them switched to 90-day prescriptions filled by CVS' mail-order service, for "my convenience" they tell me.

Now, actual junk mail, sure, ban it, for all I care. But there's a lot of legitimate mail still going out every day.