How big is the universe? Its size, specs? Is it finite or not? Sayng we need a computer or another universe just like this one to answer those questions is no answer. It means we dont know. Kind of like we dont actually know the universe is Deterministic but it suits humans to think of it that way. Like we say "if we knew all initial conditions". Well we dont know all initial conditions. So we are faced with a huge contradiction between our idealistic vision of a Deterministic universe and the reality of the matter which is that Nature is loathe to give up all her secrets.
All through the ages humanity has been chasing the dream of certainty akin to peeling an onion with infinite layers of skin. Each time we think we have arrived at the kernel, another factor - known or unknown - pops up to spoil the party.
In my opinion nature is making the more important statement. It is saying the universe is ultimately non-deterministic because we wont ever know all initial conditions and hence we can not know whether each and every influence upon our universe is Determinstic or not. How can we say we know the nature of something we can not measure or observe? Claiming the universe is Determinstic is doing such, and by extension it is trying to tell nature how it should behave as opposed to accepting it as it is.
However i dont see it as a failure or that it should in any way stop us from trying to make better and better approximations, and peeling back as many skins as possible. Life is an adventure and who knows what's under the next onion layer?