If you know how to tie them just right, with dental floss to a part of the rim, you may be able to drive one of these leaky stems from Harrisburg,PA to Columbus, OH.
You’re joking, right? You didn’t actually keep these together with dental floss, did you?
I mount and balance tires for myself and my extended family; it has saved a lot of money over the years and solved many problems. That said... I haven't noticed any difficulties with the Chinese valve stems that I have installed. They cost about twenty cents a piece when you buy them in bulk... they don't last forever. That is why you often replace when you put a new tire on a rim. If this is happening regularly with new tire installations; I would say it might be partially a problem with the people working in tire shops.
Honestly, part of the responsibility of driving is making sure that your vehicle is up to the task. This includes checking your tire pressure on a regular basis. Who among us hasn't had a slow leak? They can be very frustrating and can damage your tires. Chinese valve stems might be responsible for a small percentage of slow leaks but I seriously doubt that they are the leading cause. Most of the Firestone debacle few years ago had more to do with people using improper tire pressures than the quality of their product.
These days too many people take no responsibility for the basic maintenance of their own vehicles. Modern cars and trucks are so good that often you can get away with it... I can't tell you how many slow leaks I have had to fix over the years. Some of them were from leaky valve stems, so far none of those stems were from China. If I damaged a tire from running it under inflated I accepted a portion of the blame myself.
My guess is that this lawsuit is just one more ambulance chasing attorney trying to make a bundle off what is basically a nothing deal. I expect to see the price of valve stems go up in the not so distant future. The lesson for the rest of us is to check our tire pressure more regularly.