Well, we can never be sure that we’ve found the lowest level of reality. But the Born rule fits in with the rest of physics as well as can be expected. There’s no special evidence that it can be reduced. So when people try to reduce the Born rule, I think “That doesn’t seem likely to be right—the simplest explanation of the evidence is still that the Born rule is fundamental.”
And when there’s a trend of people trying to reduce the Born rule without also explicitly trying to reduce other stuff, e.g. the Dirac equation, I think “I wonder what makes people pick on the Born rule and not the Dirac equation.”
Well, we can never be sure that we’ve found the lowest level of reality. But the Born rule fits in with the rest of physics as well as can be expected. There’s no special evidence that it can be reduced. So when people try to reduce the Born rule, I think “That doesn’t seem likely to be right—the simplest explanation of the evidence is still that the Born rule is fundamental.”
And when there’s a trend of people trying to reduce the Born rule without also explicitly trying to reduce other stuff, e.g. the Dirac equation, I think “I wonder what makes people pick on the Born rule and not the Dirac equation.”