Sentence:  The reason to do this is that if you set up a single macro on one <WSD>hotbar</WSD> button to use multiple abilities, you won't be able to see when they refresh unless they are visible on the screen — placing them on another <WSD>hotbar</WSD> will let you press them individually as they refresh, or simply push your batch macro again. 
Meaning of the word marked with <WSD> tags:  A panel of buttons which to which users can assign frequently used commands.