I suspect most of this is about the elimination of the de minimis exemption (which the article explains) rather than tariffs per se. A lot of countries previous

I suspect most of this is about the elimination of the de minimis exemption (which the article explains) rather than tariffs per se. A lot of countries previously had 10% tariffs and whether tariffs are 10% or 50% or 100%, that's just a number in a spreadsheet. You will have systems to collect and handle that regardless. But de minimis elimination suddenly means collecting tariffs on something you previously never did. That's new. I actually support eliminating de minimis. The rest of the tariffs nonsense we've been going through for 8 months is objetcively insane. Another aspect to this is international agreements that make domestic delivery free for an international sender who just needs get parcels to a port. Such an agreement was made when deliveries were so one-sided. So we had a situation where shipping between China and the US was cheap (by sea) and there were no charges for domestic delivery and no tariffs.