You say you're red/green color blind? I hate to say this but it sounds like you're full of it and a bad player, blaming your badness on color blindness, rather than trying to improve yourself. The two possible tether colors are red&green and blue. If you're red/green color blind as you say, then you would not be able to distinguish between the red and green of one set of tethers but it doesn't matter because that's not the thing you need to care about. All you have to do is see that the blue tether is different from the other tether. Source: my roommate is red/green colorblind and has no problems.

FFXIV won the award for most disability-accessible mainstream game of the year for 2013. The dev team has consistently designed mechanics with disabled, colorblind, and hearing impaired players in mind. I'm ashamed that you'd use your disability to dump on the monumental efforts of the dev team to make this game accessible for YOU SPECIFICALLY.

tl;dr you're bad and you're blaming the dev team for the fact that you're bad, even though the dev team specifically designed the fight to be accessible to you