The vast majority of the UI mods I see streamers use don't do anything but change the UI in a way that's easier for them to understand/parse int information the game already gives you. It's like me having my job gauges in the upper right corner, by the minimap and resizing the hot bars. It's not going to be a huge deal, even to raid groups, since there's already high end raiders that do Savage/Ultimate on consoles...