Lawyers are trained to think in complexity but complexity can come in the way of clarity of their advice. A lawyer may understand every nuance of a contract, statute, or judgment. However, professional expertise loses much of its value if it cannot be translated into advice that the client can understand and use. Through clarity, lawyers are making their reasoning more transparent which facilitates informed decision-making by the clients.
Legal advice is ultimately given to help clients make a decision which is why it is both a professional and ethical responsibility of lawyers to make their advice accessible and understandable.