We got CDC only because SE decided to put us on the sword and not the dagger. I just as easily of been the other way around with us stuck with lol RS (only good when stacked). CDC was designed to be a powerful WS for BLUs and PLDs, RDMs got it the same way we got all our past buffs, incidentally. Just look back to the enspell 1 buff, SE changed the way magic acc was calculated not for RDM but so that SCH could use /RDM for enspells. One of our job defining set of spells got buffed not for RDM but for a different job to use. We could break 300 skill for awhile, yet all our self buffs were capped at 300 until WHM and SCH were able to easily break 300 skill natively. Then SE goes in and raise's the cap to 500. They didn't raise the cap for RDM, they raised it for WHM and SCH.
Is there some rule I missed somewhere that said that if they give a Sword update to PLD and BLU, they must give it to RDM too? Because apparently that rule didn't apply to Sanguine Blade. Maybe you would've been happier if we did get Rudra's Storm instead of CDC. At least then you would've been justified in getting all riled up about it.

Those other points aren't even remotely the same because all jobs with Enhancing skill follow the same rules. Taking RDM off CDC is as simple as crossing it off the jobs eligible to use the weapons that provide it. And even then, RDM did end up benefiting from them too, even if you have to act all indignant because they weren't exclusively for you. Or is it that you want only RDM to be capable of going above the cap?