Tempdata vs Session in Asp.net MVC

Why Sessions are Not Recommended to use in MVC One of the Fundamental Principal of Asp.Net MVC Framework is  Web is Stateless And AspDotNet MVC is Stateless AspDotnet WebForms is a try to make Stateful Modal But Its difficult to main it as this modal does not exist . Sessions Create lot of load on Cache that was biggest problem . Using Session in AspDotNet MVC is like...