CD swaps have been shown to not always be the best. Most of the time it results in lower DPS over a 5-15 minutes period of time than just leaving CDR braces on.
For one skill it works, but when you do it for all skills it gets messy.
All in all a lot of factors go into whether or not it is optimal for your individual toon:
-) do you multilog?
-) device? (Device lag/screen size)
-) lag
-) what would you be swapping (sometimes the gain is so small the mistakes can make the gain nullified).
This is one of those things where there is no one right answer for all toons and it largely depends on the individual players. Each player needs to run their own tests and optimize their build off what they are capable of doing.
The math will always say one thing, numbers are what they are, but at the end of the day a person has to manually press the buttons to use the skills and human error will always be a factor. Thus, while doing the math is 100% necessary, it doesn’t give the whole picture and actual tests in game are needed in the end.
I played a fire mage, and all my in game tests showed a drastic loss in DPS from extra hotswapping due to how many skills I was utilizing, and as such I determined that ring hotswaps were the best for how I played my mage, not to mention I was usually trilogged (cuz arawn had massive shortage of players then).
I never really played an ice mage and I default to Krummy’s expertise as he has poured more time into the class than anyone else so far, and all of his tests point to CDR hotswaps being disadvantageous for ice mages, but if your tests point otherwise then you should do it!
Corrupt is a warrior, he makes ludicrous suggestions across all the class forums based on information he has read here but has little actual experience with, so he is constantly making impractical (swapping) suggestions because they look good on paper. Perhaps one day when he no longer has that snobbish attitude and inflated ego he may actually learn something.
Even across mages there are some who will blindly say more swapping is always better. I know that among EG ice mages CDR swapping is very popular and among fire mages tertiary swaps are also popular just because it’s commonly perceived that more will always be better.
For rangers, wars, and even to an extent, rogues, brace and ammy swaps along with rings work very well, but these classes also have very limited skill spam compared to mages and Druids who are always in cast of a skill.
That aside, I have to agree, although I am strawmanning here, if you don’t play a mage and or you haven’t taken the time to do the due testing, please don’t act like you have

Feel free to pm me about anything or talk to me in game
Bob The God
This Bob guy is a guide? Legitimately?
Former EG try hard who’s now relaxing midgame on crom.
Fire Mages are where its at