if labor is continuing to improve its value (through education, training business skills, learning new technology, etc.) then it continues to have bargaining power in wage/contract negotiations
if a company can produce the same or more output with more capital (generally cheaper/scales better) and less and/or cheaper (younger/less experienced) labor, then it generally will
this is why we're seeing so many "ageist" layoffs at the large tech and industrial companies in the west
old employees are very expensive (especially with pension programs) and they're often not necessary to keep the output constant, or can be replaced/outsourced, for the sake of pumping up equity/shareholder value because cost cutting is currently a lot easier in tech than the R&D/acquisitions needed for increased revenue gen
there are a few things that could happen to increase the bargaining power of labor and increase wages/time off work (benefits): 1. the supply of labor drops (a war/natural disaster) 2. the supply of capital drops (luddites/natural disaster) 3. the quality of education increases 4. labor unionizes 5. TFP (total factor productivity) increases
i don't know chinese labor market specifics but my general impression is that it's much more cut throat because there are just so many more people, the tech companies are playing catch-up in some sense to their western counterparts, the jobs are more blue-collar oriented (rather than white-collar services jobs which have more wiggle room), and because of cultural/government/societal factors that prioritize hard work and family/society dynamics over individual liberty and health