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Why is the string sealed

I am curious why System.String is sealed?

I know that I can do everything I need to not inherit it, but still - why?

There are many classes that, by their nature, are strings that have specific methods and properties. These are identifiers, emails, names, etc.

Object-oriented design offers encapsulating functionality in a particular class. And here we have a strange situation when the most useful fundamental type in the most popular object structure does not expand.

Thank.

The editors.

Commentary on immutability. It's easy to hide all state-related stuff in private methods and allow child classes to have read-only access to class data.

// Safe inheritable immutable string (pseudocode).
class String
{
   // Private state
   private byte[] state;
   private void EditState(byte[]) {}
   // Protected read-only access to state
   protected byte getReadOnlyData() {}
   // Available to child classes overridable methods.
   protected virtual getHashCode() {}
   protected virtual xxx() {}
}

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