The diversity and the homogeneity

I'm now interning in a US company. There are a wide variety of people in the company. I used to work in a Japanese company where the culture was very consistent. Working in both companies, I can see that they're very different from each other.

Normal Japanese people with permanent jobs have to work long hours, so the company tend to hire only men who can work those hours, hesitating to hire women, thinking they can't work those hours. This tendency lead to the homogeneity in the office.

On the other hand, US companies allows their employees to work flexible, short hours, leading to a variety of people who can work there. They even have unisex rest rooms in the office, something I've never seen in Japan.

If the Japanese companies review their working condition, they can also have the diversity in companies. Now, the population of Japan is decreasing; Japanese companies can't continue with the same ideals. They have to make use of the people who have been ignored, women , unemployed youths, and immigrants.