The really sad part is that CM Punk probably doesn't even realize that his health, safety, and well-being was as exploited by Dana White and Duke Roufus as it ever was by Vince McMahon and WWE.
Probably worse. For as bad as wrestling is for you, most wrestlers don't end up with pugilistic dementia. I remember when I was a kid, me and my cousin wanted to take up boxing, so we asked my uncle to take us to train and he looked at us and said, "no, everyone who boxes ends up with slurred speech." Hulk Hogan and Ric Flair were just on the Dan LeBatard show and even though both of their bodies are broken they are still cutting promos like its 1985.
How many former employees (sorry, independent contractors) of Vince McMahon did not reach the age of 60 or even 45? As much as he disgusts me, I highly doubt that number will ever be anything resembling like that for Dana White.
Are we pretending that those were problems with the act of wrestling vs. the act of fighting in a cage? Drugs, steroids, suicide, etc. are problems with pro wrestling, but have much more to do with the culture around the sport than the sport itself. Everything about professional fighting from the practice to the actual fights is about trying to maximize the damage you do to your opponent. Wrestling on the other hand is about how to protect you and your opponent and minimizing damage. Neither are safe, but you are going to take a much bigger physical beating on the day to day fighting. Wrestling may be worse in the extreme long term, because wrestlers are able to wrestle for far longer than a professional fighter is able to fight. Honestly, go back and watch Chuck Liddel's fights, and note how quickly his prefight interviews go from sounding like an articulate dude who could do your taxes to almost unintelligible. If you start at the first Tito fight, he sounds like an English teacher, but by the second Tito fight he sound like a completely different human being. That is a two and a half year span. Unless there is a Steve Austin head drop or something, it can take a decade before a wrestler shows that kind of obvious trauma.
I disagree with a few of your points, first MMA fighters have just as much steroids, drug, etc. culture as pro wrestling. There are tons of fighters from years past who admitted and have been caught with drugs and steroids to the point the UFC has had to shoot itself in the foot with USADA busting some of their top stars to quell the risk of scandal of their sport being revealed as "dirty".
Second the day to day training for a fighter during fight camp is more damaging and intense but they also get a hell of a lot more time off and few fight more than 3/4 times a year on the major stage compared to all the dates pro wrestlers in the past worked hurt or not. Also even Daniel Cormier said when he tried out pro wrestling that it was way harder bumping all the time than training for Olympic Wrestling or MMA because you have to let your opponent beat you up whereas in fighting you can control a lot of the damage coming your way or stop guys dead without taking any shots.
With Chuck Liddell sure he does have a significant change in his speech patterns and expressing his thoughts verbally but he was also a noted partier who was rumored to be a heavy cocaine user and drinker. Also since you mention Tito in your Chuck example he sounds the same from his UFC debut in 1997 to now and he took as many shots and trained harder than almost anyone of his era and came out fine.
As for wrestlers not showing trauma look at Foley during his prime years in the mid nineties, the man went from ECW/IWA Japan doing hardcore style and cutting the best promos of his career to WWF in the Attitude era only 2 years later and admitted in his book and in Beyond The Mat as suffering horrible memory loss and getting lost trying to find his own house driving home or his room in hotels on many occasions due to the increased amount of dates week in and week out causing way more wear and tear than the sporadic ECW/Japan commitments.
So it's not cut and dry and really comes down to the individual, their genetics, the damage they took and the way they took care of their bodies and health.