“Less is more” is a saying that was first heard when talking about architecture and furniture design. It refers to simplicity of style.
“Less is more” sounds like an oxymoron.
But it is actually (na verdade) a popular way of thinking in education nowadays (atualmente).
When writing, it is tempting for students to be verbose and use a lot of fancy words to try to impress the teacher.
But actually (na verdade), it is better to write clearly and simply in order to communicate effectively.