I apologize for the self-serving intro but that's the easiest way to drag attentions.
As for the competing issue you concerned I reckon it's quite the other way around. It's not like way beyond necessary hand-holding voices but just some 2 or 3 words warnings. For example if you stand in something bad it's gonna say 'run away'. If the boss is casting some big wipe AOE, i.e. Tortos' breathing, it's gonna say 'XXX incoming', 'interrupt', etc. So I'd reckon it kinda frees the raid reader from watching the timer and announcing those regular things.
Probably I should make a video demo during the weekend. My text description sucks anyway. Just like text warnings are not so vivid comparing to visual + voice ones. (self-serving again, sorry, lol. )