Because it isn't elegant. You can do it (but you must bind to an EVENT scoped
component, or SESSION I guess, just not conversational). N.B. You can also
inject the JSF component using
@In("#{uiComponent['clientId']}") UIComponent cmp;
which I think is much neater (and doesn't have scope restrictions).
I haven't used this pattern much, so can't offer best practice advice atm.
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