Doesn't matter.

By the time you're an adult well into your career, you're bound to have a firm grasp on a wide-ranging palette of vocabulary. From hanging out at a bar to briefing a CTO, or from drafting a casual email to reading legal documents, terms of a loan, whatever. It's exceedingly rare that I have to go look a word up, or feel like I'm struggling to think of a word with just the right nuance and level of formality for any given situation. I can't think of the last time I've been in either situation.

Are there obscure or very specific words in other technical fields that I don't know at a glance? Of course, nobody is going to have 100% mastery of the entire English lexicon. If someone put the word "hypertrichosis" in front of me I wouldn't have known what it was.

But seeing words that you effectively will never have an opportunity to use, is not improving your vocabulary. It's not a value-added exercise. Better things you can be doing with your time.