Why isn't ASP.NET MVC 2.0 part of the .NET 4.0 BCL?

Why isn'开发者_如何转开发t ASP.NET MVC 2.0 part of the .NET 4.0 BCL ?

ASP.NET MVC is being developed with a yearly cadence, unlike the .NET Framework which releases major new versions every few years. Tying ASP.NET MVC with the .NET Framework would put severe constraints on MVC's release schedule and functionality while not offering any tangible benefits to customers.

Think of it in much the same way that Silverlight is released with a somewhat yearly cadence. Part of Silverlight's flexibility and the speed at which new features can be added is due to the fact that it is an out-of-band release and is not tied to the .NET Framework proper.

I would say that these two items have different project time/release cycles and putting them was something that didn't make sense to each project.