Vague wording in the constitution allows the document to adapt to different eras in American history. This is why the US Constitution is referred to as a "living document."
The vague wording allows for new interpretations to be made about what these rights protect. For example, freedom of speech is a term that during the early stages of America referred to public speeches and writings. Now, with modern technology, freedom of speech can also refer to posts on social media sites. Since the Constitution uses vague wording for what freedom of speech entails, it allows for the Supreme Court to interepret what this means and how citizens can use this platform to express their views.