[goatlover]

Biology is possibly even messier and less like a computer. For that matter, biology isn't even really machine-like, only pseudo-like in some ways. But some will rebut that the universe and everything is doing computation, as if it's meaningful to consider a rock or a dandelion to be a computer.

[lupire]

What's missing in this conversation is the notion of "computational complexity".

For practical purposes, everything can be modeled as a computer. But some things are impractically complex.

What's interesting is that modern computer software, and to some extent computer hardware (even after assuming perfect digital abstraction at the transistor level), is itself becoming impractically complex!