I will probably get a lot of flak for saying this, but I think it would be beneficial for society, demographics and quality of life if Chinese working hours would converge more towards American working hours. Working 996 is pretty unsustainable for both individuals and society. In the US, you have decent paying jobs with standard 40-hour work weeks, while there are still plenty of jobs available for people that want to pursue higher incomes working 50-60 hours per week. Unfortunately, you also do have jobs where people are forced into overtime working 60+ hours per week just to sustain themselves as well. Working hours tend to be balanced along the middle strata of income in the US, steadily rising along either ends of the spectrum (highest earners and lowest earners). Another implication to consider would be that by decreasing working yours, you can employ more people.
I totally agree with your sentiment. Working long hours such as 996 is detrimental to people and society. Since low birthrates are an issue, if you want people to get frisky having them toiling away at 996 is probably not going to advance that much. Personally, I think Americans are too devoted to their jobs and place too much emphasis on career achievements or their personal self to their jobs, worst amongst western countries. To me, a job is a means to an end, to live life. But in China, the problem is there is just too much competition for for even decent roles, and there are so many people waiting to take it if you want that you are basically forced to commit to 50-60 hours.
I think people should follow their aspirations, but also need to be realistic and pragmatic. I think many of us have creative aspirations, but let's be real its hard to pay the bills with just that. Its a balance between working the jobs we need to achieve a decent/comfortable standard of living while still having time and energy to devote to individual pursuits that let us dabble in those dreams. Short of legislated government intervention to to tilt the balance towards workers which is how European populations got what they have ,the rest of us in competitive societies will have to strike that balance on our own. in China, its more challenging because there are still plenty of workers. The aging population has certainly forced industrial and certain service sectors to improve what they offer employees to avoid shortages, but as you noted for professional level jobs the market is heavily imbalanced with too many graduates and too few roles so people have no choice but put up with 996. The sad reality is in China there are still plenty of people to exploit in the labour force and most workers don't have the bargaining power, even at the upper quartile but even a convergence towards American labor conditions would be a huge improvement.
Young people in China are now facing the same challenge as young people in western countries which is much of the education they were sold on is badly devalued, and they are left holding the bag to figure out how to maintain the standard of living while not having your soul crushed in the process. Personally, I think what would be great for China would be some kind of national service program that can enroll youths where they can contribute across different sectors of society and be provided renumeration, room & board.