It's actually a really useful concept in any kind of intercultural communication, e.g., international business - that's actually a big reason why "Japan is a high context culture" is such a common buzzword - it goes back to the "How to do Business in Japan" boom of the 80's.

In fact, a big part of Hall's theories came from his work in the military, doing how-to guides for people going on assignment overseas. His work is extremely practical and applicable to daily life for anyone working cross-culturally. His theories were designed to be useful for the average soldier. Seriously, he's one of the people who developed the concept of "personal space," which I'm sure you've heard of.

I work with a lot of automotive and tech companies, and in a multinational corporation, you're almost guaranteed to end up on a multinational, multicultural team at some point. If you have any kind of ambition in life, these ideas are helpful.