I've replaced about 6, across 3 vehicles in the past 5 years.
Prior to that, I can only remember replacing 1 or 2 in the past 30+ years across probably 30+ cars/trucks.
Started an arm joint rebuild on the rear upper arms. Pretty worn out. No grease was getting into the ball and bushings. It’s a Teraflex long arm set up. Had to make my own bushing compressor.