You are missing the fact that all servo motors are not the same, just like all car engines are not the same. Some servos are just bare bones without a lot of features. I sew for a living, so I need something that's reliable. When I first started looking for a servo motor, I did a lot of checking and comparing before buying. I have three Sew-Quiet motors on my sewing machines, including one that runs my extra heavy duty long arm Singer 144, and none has ever given me an ounce of trouble.
No one lives forever, the trick is creating something that will.