Again I agree with you, because I had a similar experience. But, again, my conclusion is different than yours.

You write that we should not talk about biochemistry as computation, as far as I understand. Instead I'd say that we have not studied enough how nature does computation without programmers or even human friendly semantics.

Is still computation, involving space and physics. Too complex to efficiently simulate it (for now) but not big enough so that the emerging behaviour is simple, like for a gas.