Overworked Chinese workers have been making western consumers better off for more than two decades now. Chinese domestic consumption is very low even among developing countries, negligible compared to its gigantic export.
Upon joining WTO one prerequisite is 5 days-8 hours work week, while presently in China you often find 996 schedule instead, with factory workers even worse with 12 hour shifts and 2 days off a month.
It is simply sweatshop in the 21st century again, a hallmark of Neijuan.