Software Architectures Patterns and Styles - Where is the observable pattern implemented in ASP.NET MVC implementation ?

The following material may be a bit out-dated, but I find it thoroughly essential for any developer to understand/be familiar with: Microsoft Architecture Guide.
After studying section Architectural Patterns and Styles, an interesting realization came out of it, that I believe most ASP.NET MVC developers have not thought about it (or are not aware of it):
The MVC pattern, although it relies in the Observable Pattern, in its ASP.NET implementation, does not implement any observable, publish/subscribe behaviors. This asp.net form question and answer summarize the topic.