The possibility to use Variables in Fragments create and flexible opportunities. But it is not so user friendly that you need to know or remember the name of the variable. If this names could be picked from a dropdown list it would be much easier to use for the email creators. Just changing the variable and then the content for that variable. No it is hard to and difficult to use for a "normal" front end user because you dont know what to wright into that field to get it to work.
