Note that Richard is not treating knightian uncertainty as special and unquantifiable, but instead is giving examples of how to treat it like any other uncertainty, that he is explicitly quantifying and incorporating in his predictions.
I’d prefer calling Richard’s “model error” to separate the two, but I’m also okay appropriating the term as Richard did to point to something coherent.
Because there is more data available for FP32, so it’s easier to study trends there.
We should release a piece soon about how the picture changes when you account for different number formats, plus considering that most runs happen with hardware that is not the most cost-efficient.