It’s all about making money. When I had my ‘99 Durango the upper ball joints were bad. Took it to the dealer, they said you could only replace entire upper control arm that came with a ball joint. 800.00 part I believe.
So I take my happy butt to local parts house. I buy Moog ball joints for $45.00 a side ( greasable ) I drill out the rivits and bolt them in. I saved a ton of money and didn’t get screwed by the Dodge dealer.