Why Japanese Salaryman don't back to university to develop their own skills?

I have seen a lot of articles which is saying Japanese Salaryman don't back to university to develop their own skills, or in other words, the Japanese won't spend time studying after their bachelor graduation. But also a statistic show that Japanese adult study average 6 min per day among 30 years old to 60 years old. Studying 6 mins per day is one of the shortest studying time in APCP countries in 2019 (I'll argue the statistic result in another blog ). Contrary, the Japanese are familiar with Kaizen culture in the manufacturing industry such as Toyota. Why have I seen such a negative article/blog on the web page? Nevertheless, why don't the Japanese spend time studying? Thinking of the figure and my experience, I reached out interesting assumption which is caused by cultural context, Japanese corporate structure and social pressure. Let me explain it in three aspects. 

Cultural context; Japanese spend more hours in the office than other countries. When I worked in the Netherlands, most of the employee doesn't stay in the office after 6 pm. I'll be the only person in the office after half-past six in the evening. On the other hands, the Japanese office worker stays after 6 pm surely and keep to work till nine to ten PM sometimes which is not a surprising situation in Japan. So simply Japanese worker doesn't have time to study in daily ordinary life. However, there is still controversial. When I look around on the train after 7 pm, most of them are just looking at the mobile phone or playing mobile app game. Then, I reached out to one of my assumptions. Japanese office workers are so tired after long hours working and don't have the energy to study anymore. Other hands, other countries office worker leave the office earlier, and then some of the study or some of them are just relaxing. Which lifestyle has more possibility to study? Of course, a person who leaves the office is likely to study. Then, the next question is if the Japanese office worker leaves the office earlier, will they spend more time studying? The argument is written in the next paragraph. 

Corporate structure: Japanese corporate culture is very unique in global standard as of seniority and mastery. In a Japanese company, an employee got a promotion and earn more salary tendency based on seniority and mastery. When I work at a traditional Japanese company at 28 years old, my supervisor asked me to stay in the same position and the same job at least for ten years no matter what I can bring result. He added that all employee have to follow the discipline to be mastery in the department. As a consequent, you can't earn more money even if you made effort and bring result. you can't be promoted even if you are one of the best contributors to the organization. That's why I left the company and moved to a foreign company to develop my skills and earn more money. And the decision was right by the way. In other cases (which is at the current company), I made a big contribution to the company or in other words I saved a company during the Covid-19 crisis by saving COGS as a purchasing. I expected an incentive for the result. However, the company won't give any incentive to any employee but just distribute profit based on seniority in the organization. How come? I was so demotivated to work and make any effort on the job after I knew the management decision. Then, what's happened to me? Frankly speaking, I spend more time on Netflix, mobile game, Youtube when I was at home. I spend more time on SNS or just surfing on the web when I commute to the office. Then I realized that I'm doing exact same things which most of Salaryman is doing on the train. And I'm just killing time than studying for improving my business skills. It totally makes sense if a worker can't earn money no matter what they made a result, if a worker can't get promotion no matter how he/she contribute to an organization, they do stop investing time for self-improvement. Moreover, you can earn money and get a promotion if you stay in the company longer. In some case, doing nothing (waiting for an opportunity) is a career strategy especially in such an environment. So I made an assumption that Japanese salaryman doesn't spend time for self-improvement if they he/she works at a traditional Japanese organization which payroll is based on seniority and mastery even though they can leave the office earlier than the current situation. 

Feature of Japanese society; I have full-time international M.B.A certification. However, I have seen many Japanese articles which is saying that having an MBA is not value at a job. Their idea is an MBA doesn't provide the skill set for daily operation. It's more efficient to master a job than studying an MBA. I think all are true. My opinion is that an MBA isn't just for success in a job, but more than that; such as networking, nutrition to life, diversity, cultural experience, academic certification and so on. The insight of the argument is Japanese people think that mastery is more important than studying in academic. In fact, I was required to be master the products as a buyer when I worked at a Japanese traditional company. It's still important to be a master of products and industry, but more important and value at job market is skill and knowledge commonly to be used no matter what industry and company. For instance, negotiation, accounting and sourcing strategy as for purchasing. Of course, understanding products and the industry are important but more useful is to know how to use the framework to do. Business school is a place to teach the frame of business on each topic than a specific area of industry. So normal Japanese worker don't face the necessity to study in business school. 

This is my observation of why Japanese office worker so-called salaryman doesn't back to school nor study for self-improvement. Nevertheless, keeping to study is important not only for career success but also for self confidence. Japanese company need to change, Japanese people need to realize, and society needs to recognize the necessity.