When a school you are applying to tells you that there is an optional essay, there is nothing optional about it. Do it! Every chance you have to showcase who you are and what you offer to the school is an opportunity that needs to be seized! And please don't take them lightly! Even the "simple" and "easy" essays are never simple nor easy. Invest time and effort in crafting a good answer that shows your personality and your fit with the school!
Read this article on how not to write off your supplemental essays: