A good command of any language is important. No point knowing
them but unable to structure them properly and causing
misunderstandings.
Whether to use a plain, simple English to communicate or having
bombastic words in your essay, is your choice. As long as their
usage is correct, it doesn't matter.
What matters, is to get the point across. A whole paragraph is not
needed to explain a simple point. Neither are big words needed to
shorten a sentence if nobody understands it.
