What is needed for English communication for Japanese companies?

Is socialization really important for business situation, especially inside the same group, for example, employee of a parent company and employee of a subsidiary company?
Both of the attendants of a meeting are not native speaker of English. They speak broken English. And they are not care about socialization. They manage to understand what they are saying each other. In the situation, the most important thing is to avoid misunderstanding and making clear the conclusion of the meeting.
In our company, human resource department prepares many English training courses, which always say socialization is very important because foreign visitors judge from what you act in the meeting, not from what you say.
I don’t think so. Foreign co-workers in subsidiaries come a long way to Japan to achieve the goal and don’t care about socialization, and they are used to Japanese customs.
So, the most important thing is to understand exactly what they are saying in the meeting for me. Then, most of the English course my company prepare is not useful for me.