China has 2 one way valves managing it's economy.
Trade is one way out and US$ is one way in.
In trade between UK/US/Canada the relative trade and $$ flows work towards a convergence. The USA/Canada/UK can not have functional fair trade with China unless the balance of $$ and good are allowed to achieve a balance.
We have seen US/UK/Canada small manufacturing get hollowed out by the dollar stores. In many cases the US/UK/Canadian manufacturers can not beat the cost if they had free good and only had to package and ship them.
True, Chinese goods are low grade and many have flaws (see Reddit r/Chinesium)
Most countries balance trade flows, China defeats the economic balance artificially with currency caps.