Out of curiosity how many players are actually colorblind though? And even if you are, you can still tell the difference between the markers right? Skull, Star, Moon etc. As for the voice com part, I've only ever thought of it as a road block if you try to pug heroic because most pugs are without voice coms but if you're raiding with a guild you're using voice coms anyways so there's nothing unique about this fight in that regard.