And yet my brain functions at least 100x faster than I can speak, leaving me to unsnarl the proverbial traffic jam in my head as the rate at which speech can communicate ideas lags behind the vast decision trees quickly generated in my thoughts.
It's much more effective for me to write something that's both clear and persuasive than trying to express the same idea with synchronous, expository speech. For full disclosure, I was trained as a writer.
Whenever the interview process includes a writing component, I invariably ace them. I'm a software engineer.