Agree 100%. If you look at this thread that I started over on the General Discussion forum you'll see page after page of similar concerns and observations:
http://www.lostjeeps.com/forum/phpBB3/vie ... hp?t=40982
I had an interesting conversation with the Director of Pro-Axle here in Sydney today (Pro-Axle is THE alignment specialists for 4WDs and trucks in Sydney). I went in to get my KJ re-aligned after having the Bridgestone D694 LTs mounted. The Director (Brendan Power) seemed to know a lot about Jeep engineering and had some nice things to say about some components (like those front A Arms - which he compared to Mercedes in terms of strength and design) but he also admitted he did not understand why they would design a quality component and then make it impossible to change the ball joint. They did a first class job on my alignment BTW.
So after all the feedback I am now convinced that I should stay with the stock A-Arms and direct my efforts at trying to limit UBJ impacts to prolong the working life of the UBJ in the Upper Arm. I am working on a basic spring coil bumpstop that I hope to have ready for Camp Coffs. The limiting strap (if it can be made to work) maybe the longer term solution.