I am going to disagree with you there wholeheartedly. No elite athlete (meaning Olympian, professional athlete, or international-level athlete) uses xfit as their core fitness program. I would argue that it (with "it" meaning xfit has never produced or been credited with the success of an elite level athlete) has been proven over, and over, and over again and never been disproved. If elite athletes don't do xfit, and consistently spank xfit "athletes" when pitted head to head (which they do), that's not saying Chevy vs Ford. It's more like saying, "Chevy vs Schwinn", except everyone in the Schwinn camp consistently tells Chevy that their system is better, and smarter, and capable of producing winners, when in reality the record is 100% in favor of actual programming and specialization, and not in the camp of random non specialization.That's probably been disproven just as many times as it's been shown to be true.
This is getting to the point of being equivalent to a group of people bench racing their Chevy Vs. Ford
The only time that xfit is found to be the best training program is when it is judged only against xfit. Only at the xfit games is xfit training to be found the gold standard. In every other athletic discipline, it is at best a fad and quickly dismissed by real athletes in favor of professional programming.