Increasing our vocabulary is important in all fields, if you ask me, it is more important in Communication skill. Because, the more you know about how and what words to use words the better your language gets. We can never be sure of knowledge that we gain would be of any use or not in future but language is something that we can always be sure of cause, we never stop talking and experimenting with words.
Tip time! Watch different genres of movies/series/shows to expand your vocabulary not just one.