Because the Kennel Clubs are worse than tradcaths when it comes to "following traditions." Most of the members have been in the KCs before time itself existed and they can still remember the marital issues of a lovely couple named Adam and Eve. It's all old money shit too, so for the AKC think Hunter Hearst Helmsley (not Triple H, his first gimmick) aged up by around a millennia and the stubbornness that comes with that age. Anyone who brings up changing the breed requirements is ignored or actively drummed out and they're also big on making sure ALL the KCs are on the same page. So if the JKC doesn't want to change it, the AKC and EKC will go along with it. They also don't let young people have a say until they "pay their dues" (read, share the profits and obey the SCs in charge of the club) and by then they're cranky old fogies themselves. Not to mention, getting in on it is impossible unless you know one of those cranky old fogies. It's a perfect storm of old money bullshit here in Current Year.