It would be highly unusual to run meetings like standup where nobody else spoke the language two people were talking in. It’s different if they’re talking outside of a meeting.
It does. If I worked at a Japanese company, I would learn Japanese. I would respect the culture of the country I emigrated to. Otherwise, why would I live there?
Really? I’ve spoken with French developers at Nintendo HQ who spoke no Japanese and nobody seemed to bat an eye. In fact I first met them at some meetings with very high level execs.