[richk449]

It sounds like you are making a distinction between digital (silicon computers) and analog (biological brains).

As far as possible reasons that a computer can’t achieve AGI go, this seems like the best one (assuming computer means digital computer of course).

But in a philosophical sense, a computer obeys the same laws of physics that a brain does, and the transistors are analog devices that are being used to create a digital architecture. So whatever makes you brain have uncountable states would also make a real digital computer have uncountable states. Of course we can claim that only the digital layer on top matters, but why?