In the case of my front struts, at this point nothing is wrong with the front end, but eventually I may need a new wheel bearing, a new axle, a new tie rod end.
and a new control arm ball joint. Removing the front strut means all these parts are suddenly accessible. Might as well wait until something more needs replacement. This is assuming that the coil spring does not break. I believe the 2005 coil spring was better built than the 2000, which did fail on my 2000 Taurus.
Also, if doing a wheel bearing and a strut I can totally remove the rusty knuckle and take it to a machine shop to press out and reinstall a new bearing rather than me spending a day trying to pound out the original bearing.