It's a never-ending game of CM roulette
One can choose to call, or not call, Disney- depending upon how they plan their vacations. The reality of the situation regarding the call centers, as I perceive it, is that the total combined numbers of all the people- when added up from all the different WDW enthusiast boards- adds up to a miniscule percentage of the hoards that visit Disney annually. Yet, somehow, all the rest of the world manages to get there just fine and have a wonderful vacation by doing what? Calling Disney and planning their vacations- because that is all they know to do.
In my experience, Disney call center CM's get it right much, much, much more often than they get it wrong. You will read an occasional post from someone on the boards (like this one) where a CM gets it very wrong- but those do not occur all that often. IMHO many of the issues that come up on the boards relating to CMs tend to be 'gray areas'- where we get one side of the story, and that story may or may not be completely accurate.
These call centers employ a small army of people, and all of them are at different levels of experience. Some are Disney enthusiasts that do their very best to answer your questions as best they can, and for others it is just a job. The newer ones will, of course, make an occasional mistake- as happens in all businesses across the world with new employee hires. But overall, and again speaking from my experience, they get it right most of the time.
Of note is that the experienced, knowledgeable people on the various WDW boards rarely do anything to improve the system. They go to the boards and complain- but how often do you read of someone asking to speak to the supervisor of the CM that made a mistake in an attempt to have that CM provided with the correct information so they don't make the same mistake again? Based on the posts I have read over the years, this happens rarely. You don't have to like the system- but if and/or when you call- and you don't get the information you were looking for- you have a choice, in that moment, to make the system better


. I definitely feel sorry for someone less informed who calls and gets everything screwed up!