Re: Repeal the de minimis provision
I am not an expert, and you suggest that you know a lot more than I do, but I'm not sure all the problems you've named are related to the provision they're talking about. For one thing, how much the UPU says shipping a box should cost seems wholly unrelated to whether customs will scrutinize the box. You could remove China from the list of countries whose shipping gets subsidized without affecting this provision at all. I think doing that makes sense, but by bringing it up, you have slightly harmed your other points because that seems unrelated.
The other problem with your description is that many of the things that we want to buy from China don't come in bulk in a container because not that many of them are made. If they are custom design or low-volume items, then they won't bother to have a local distributor or warehouse, make enough that they can have local supplies wherever their customers might be, etc. They might, but probably won't, do that for the United States in the hope that hundreds of millions of customers might make it realistic. That's definitely not going to happen in small countries, which will find it almost impossible to buy the things in the first place. We have to balance that against the problems of dangerous or counterfeit goods sent one at a time, but I'm not sure that should always come on the side of making small shipments infeasible for everyone.