LESS 的嵌套写法有什么优势？

<div class="container">
  <h1>Title</h1>
  <p>Content</p>
  <a href="#">Link</a>
</div>

.container {
  h1 {
    font-size: 24px;
    color: #000;
  }
  
  p {
    font-size: 16px;
    color: #333;
  }
  
  a {
    color: #00f;
    
    &:hover {
      text-decoration: underline;
    }
  }
}