No it isn't. An "action=" attribute isn't a function call or logic expression, it's the specification of the name of an action processor that is to be invoked. The action processor is a public method that take NO arguments and returns a
String.
Action processors get their "parameters" from the backing beans. These properties are set as part of the
JSF lifecycle when the data that to be set has passed validation. Normally an action is fired as part of a form submit process, so this is the same basic thing as having a form processor get called where the form's fields have been stored into backing beans.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.