title: Where case classes should NOT be used in Scala?
body: <p>Case classes in Scala are standard classes enhanced with pattern-matching, equals, ... (or am I wrong?). Moreover they require no "new" keyword for their instanciation. It seems to me that they are simpler to define than regular classes (or am I again wrong?).</p>
  
  <p>There are lots of web pages telling where they should be used (mostly about pattern matchin). But where should they be avoided ? Why don't we use them everywhere ?</p>