Classic is expected to use the same modern UI that is being used in retail, but the ISBoxer add-on has never been required in order to make ISBoxer work with WoW, seeing that it works with many other games, all of which do not have the same level of add-on capability. As for the "stuff" that the ISBoxer add-on does, is it just stores the macros created in ISBoxer and assigns them a key bind, in game.
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