I see no reason for wholesale replacement of the ball studs/lifters. The rocker arms are another story. MB says all rockers should be replaced with a new cam.
Rockers that have had one failure usually mean they are wearing through the surface hardening. Its a mess very soon afterward.
These motors are basically indestructable! They do not wear out. The only bottom end damage I have ever seen came from running without oil or water for amazing intervals.
Bosch Master, ASE Master, L1
33 years MB technician