How many people can even afford to get multiple opinions for a weird lump on their back? Or go to the dentist for a strange toothache? How many people can afford to get consistent exercise and eat healthy? How many lives would be saved or at least massively bettered? We already have the means to extend the life expectancy of the average person, and it's not being used. Obviously this is a wonderful medical advance, but it's depressing to wonder who it's for.
I'm as negative about the rich and powerful as anyone but this is such a cynical take - that might have been applied to many medical treatments in the past that have become relatively commonplace and easily accessible to people of all classes, at least in sane countries with sane healthcare systems.
I'm explicitly not saying this work shouldn't be done, it should! But it does not exist in a vacuum, and it would be silly to pretend that it is not colored by vastly unequal access to modern healthcare. The reason I get excited about technology is because of the potential it holds for making us all happier and freer to do the things we like for longer. We are lost if we do not at least speak about the thunderclouds on the horizon for this philosophy of technology.