"I don't think thereis anything inherently bad about the parking brakes, that is pretty basic vehicle tech and the Jeep brake is pretty typical, they just need to be adjusted when they loosen up."
The problem with the JK is how fast the parking brake loosens up after you adjust it. It's a matter of weeks at most before it's out of adjustment. I had one for 7 years. I wasted a bunch of time checking and adjusting it the first year I owned it. Every single person I wheel with says the same thing. Sure, you can adjust it. But it won't last. Most people don't bother to adjust it because it's a pain in the keester and you have to do it all the time. They just assume it won't hold and deal with it.