The doctors that sign off the cremation have to provide info on pacemakers/artificial joints and so on to the crematorium
That all is significantly more expensive than saying "you hand us a form telling us whether there's a pacemaker or not, and if you fuck it up you get in trouble."
Fair point on suing people probably being cheaper, though. -.-
Would you have to remove the joints as well then? How are you meant to properly dispose of something like a knee or a hip?