Come to the Lynnwood, WA (ZIP 98046) postal office sometime. You’ll see that 20+ minute line, and an APC that will only sell 3 stamps at a time, minimum (unless you want to purchase priority mail stamps, or certified delivery, in which case you’re looking at $3.20+ minimum).
I use the downtown Edmonds branch - 4 miles away - which never has the line, but still has the APC limitation of 3 stamps minimum.
Ours is a 5 stamp max, which was kind of entertaining when we had nearly a full roll of old 1 cent too little stamps. 5 1 cent stamps, 5 1 cent stamps, 5 1 cent stamps...... They really need a “do it again” button.