One possibility is that there aren’t many risks that are truly unknown, in the sense that they fall outside of the categories Toby enumerates, for the simple reason that some of those categories are relatively broad, so cover much of the space of possible risks.
Even if that were true, there might still be (fine-grained) risks we haven’t thought about within those categories, however—e.g. new ways in which AI could cause an existential catastrophe.
One possibility is that there aren’t many risks that are truly unknown, in the sense that they fall outside of the categories Toby enumerates, for the simple reason that some of those categories are relatively broad, so cover much of the space of possible risks.
Even if that were true, there might still be (fine-grained) risks we haven’t thought about within those categories, however—e.g. new ways in which AI could cause an existential catastrophe.