I think that SIA is generally* valid but it uses all its power to prove that I live in the infinite universe where all possible observers exist. After that we have to use SSA to find in which region of the multiverse I am more likely to be located.
*I think that the logically sound version of SIA is “if I am in a unique position, generated by some random process, then there were many attempts to create me” – like many earth-like-but-lifeless planets are in the galaxy.
Another point is that the larger number of short civilizations can compensate for their “shortness.” We can live in the region of multiverse where there are many short civilizations and almost all of them die off.
I think that SIA is generally* valid but it uses all its power to prove that I live in the infinite universe where all possible observers exist. After that we have to use SSA to find in which region of the multiverse I am more likely to be located.
*I think that the logically sound version of SIA is “if I am in a unique position, generated by some random process, then there were many attempts to create me” – like many earth-like-but-lifeless planets are in the galaxy.
Another point is that the larger number of short civilizations can compensate for their “shortness.” We can live in the region of multiverse where there are many short civilizations and almost all of them die off.