It's a feature that allows more articulation when off-road.
One failed on my brother's blazer about like this. It was kind of "me inflicted" though. We were replacing his right upper and lower control arms and I had to take the bearing out, but couldn't get it back in all the way because either a bolt or the threads on the bearing was messed up and it was Sunday night. 2 were completely in while the 3rd was mostly in. At the time, he only drove maybe 100 miles per week so I wasn't too worried.
He called me Thursday saying the ABS light was on. I asked him if it handled differently or made any noise and he said no. Friday on his way home, the bearing gave out and he could only drive 10 MPH. It wasn't this bad though. Didn't have a crooked stance and didn't come apart after removal.
It is good to know they are still somewhat drive-able when in this condition though.