It amuses me by collecting
all the ferrous bits and pieces, including those that are too fine to be collected by the oil filter.
Some would try to argue that removing all minute ferrous trash might have some slight benefit to ball bearing races and balls, but I know more ferrous trash is being made all the time and all I am really doing is giving them just one shot at doing damage instead of allowing them to recirculate time after time after time.
Like I said, it amuses me ....
If I had the guts to run some really extended drain intervals it might amuse me more, but I don't -- I still change the oil every year and change the filter every 2 years (although I have been known to reuse the filter after washing out and collecting & analysing all the stuff caught in the pleats).
It all amuses the heck out of me, and that's what counts with them super duper smagnet augmented filter systems.