@Vincent Berg
As for plastic itself, it's not what it was in the '50s, as there are now clear distinctions on the quality of the product. However, the main issue with ALL plastics (aside from the harm to the environment from products which never break down), is that they age very badly, become brittle and fragile over time, especially when directly exposed to sunlight for long.
I'm well aware of the differences. Materials engineering was my bread and butter trade for many years. All plastics are a form of polymer chains, but not all polymers are the same. Thermoplastic/thermosetting polymers are typically very large molecules in a chain. The bonds of which are subject to thermal and UV spectrum breakdown.
A good explanation of the differences can be read here.
https://www.osborneindustries.com/news/polymers-vs-plastics/
As for the rest of it:
While that's true, most items build in Chinese factories (and destined to be shipped back overseas) have NO regulatory oversight, bypassing the laws in each country they're sold it.
At this point, that's a meaningless distinction, as the current administration has gutted our entire regulatory system, but it still follows that virtually anything shipped from China should be considered unsafe unless vetted through an independent source.
You need to back up that assertion as I'm throwing the bullshit flag on it. The entire regulatory system... Really??? I must have failed to notice where UL listing were trashed, or chemical regulations and controls were thrown in the garbage. From alcohol to oil to plastics, regulatory requirements and agencies are alive and well from my view, so back up that BS or retract it.