Stateful Session EJB Part 2

Enterprise JavaBeans ('EJB') is a managed, server-side component architecture for modular construction of enterprise applications.
The EJB specification is one of several Java APIs in the Java EE specification.
EJB is a server-side model that encapsulates the business logic of an application.
A session bean encapsulates business logic that can be invoked programmatically by a client over local, remote, or web service client views.
Session beans are of three types: stateful, stateless, and singleton.
Stateful Session Beans
The state of an object consists of the values of its instance variables. In a stateful session bean,
the instance variables represent the state of a unique client/bean session.
Because the client interacts (“talks”) with its bean, this state is often called the conversational state.
Session bean is similar to an interactive session.
A session bean is not shared; it can have only one client.
When the client terminates, its session bean appears to terminate and is no longer associated with the client.
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[@rentic888]

I worked very hard to learn this ejb concept in the past, is it relevant nowadays?