The big problem with Chinese manufacturing is controlling the suppliers and raw materials quality control measures. The big brands outsource a lot of components.
The quality of the wiring was usually very poor, with brittle plastic that dried out and cracked. The "copper" in the wires was and unknown alloy that was too stiff and would fail. Gears would be made with inferior steel made of melted down scrap. Sometimes when cutting through the metal components, voids would be found that retained the shape of whatever was melted down, so you would see screw threads, etc.
I have a buddy that works in the offshore oil industry, and they received a batch of 1-1/4" bolts that turned out to be a pipe that had a hex shaped piece of plate welded to it. It was then filled with scrap, and molted metal poured in to fill the inside. Then the welds were machined or ground, and the threads cut. Looked fine from the outside, but one cracked at the head, so they got suspicious. Sliced it open along it's length, and it was obvious what they had. These bolts were meant to be installed on lifeboats. There are only two of them holding the boat in the air. No, they didn't use those bolts!
This was a big problem for the major tool brands when they started moving over there, but they have slowly managed to get it under control. Makita, Milwaukee, Bosch, etc make pretty good tools over there these days. Maybe not EU quality, but getting closer.
Chinese companies that are set up for selling to low end resellers, such as HF, don't worry about these things. Their only goal is to meet a price point. Plus, Chinese have a very different view on quality than we do in the West. It's a cultural difference. Years of living behind an iron curtain have shifted their expectations.
That's why I stick to name brands, unless it's something I only think I'll need once.