I'm pretty sure pacemaker development has come a long way since the 1960s and that development is ongoing.Life is more nuanced than your black-and-white approach. Nobody asked to have pacemaker companies replacing their products everytime a new tech Gadget comes to market.
It is perfectly reasonable, however, to ask them to get rid of decades old tech and start to adjust to a new normal. Today, magnets and electrical interference are way more common and ubiquitous than in the 1960‘s, when they invented the basis of their current products, which they have modernized at only glacial speeds ever since!
Nevertheless, existing implants will be around for decades and I'd rather see Apple use their technological knowhow to work around the problem rather than rely on their lawyers to update the small print to shift the blame for the consequences.