TL;DR They severely reduced the number of components by integrating parts into larger pieces. This trades upfront cost savings for longevity concerns and repair prices down the road.
One could argue the US wants to ban them solely because it undercuts other manufacturers, but there's more.
You can also argue it's not good for many other people, like:
- the average consumer (that expects a quality long-lasting product)
- the insurance companies that will be footing a lot of the repair bills
- independent repair shops that either won't get those jobs, cannot actually perform the work due to tech/service monopolies, or simply lose revenue because the work is shorter