suspension parts wear out regularly - so do brakes,
I recently was contacted by a member on PW for help with a BMW E60 be bought used, he mentioned that the tension strut bushings wear out in Pakistan due to bad roads.
LOL
I had to remind him that the tension strut bushings wear out regularly globally as that bushing literally has to twist anytime the steering is turned. Its part of the BMW split arm suspension design which gives that glued to the road feel.
He also went on to say that the rear ball joints were worn, which I had to tell him its also a wear part and it wore out at proper mile/time too - his car was 120,000 kms but 12 years old.
Point is - maintenance is not "IF" but "WHEN" as its a machine. No man made machine exists that is perfectly reliable and requires no maintenance.