The main reason is that it makes it much, much easier to interface C# with languages like IronPython or IronRuby. This allows you to take advantage of those la

The main reason is that it makes it much, much easier to interface C# with languages like IronPython or IronRuby. This allows you to take advantage of those languages' dynamic typing, but not have to drop into C when you need to squeeze a bit more performance out of your code.