This is a great question but you need to think about it a little differently.
Postmodern thinking doesn't come to a conclusion that an objective reality doesn't exist per se.
Don't think about it as a proposition about how the world is.
Postmodernism shows through ex. deconstruction how language isn't as solid a foundation to talk about the world objectively as we might want to believe.
So, in other words, it's a critique of the idea of the absolute and objective frame of references.
It doesn't say that we can't use classical physics just that the second we start to formulate proposition about how the world is we are ultimately using an axiom to do that.
Now, this axiom is useful enough that it might allow us to build spaceships to fly to Mars but it might be that it doesn't allow us to do faster than light travel to reach Alpha Centauri.
Not sure I answered your question satisfactorily if not let me know and I will try again. It's worth spending time on.
I think I'm getting it. It's basically that we use mental modals to go about our business, but these modals will always be limited in scope. True objectivity is, in a sense beyond us.
Postmodern thinking doesn't come to a conclusion that an objective reality doesn't exist per se.
Don't think about it as a proposition about how the world is.
Postmodernism shows through ex. deconstruction how language isn't as solid a foundation to talk about the world objectively as we might want to believe.
So, in other words, it's a critique of the idea of the absolute and objective frame of references.
It doesn't say that we can't use classical physics just that the second we start to formulate proposition about how the world is we are ultimately using an axiom to do that.
Now, this axiom is useful enough that it might allow us to build spaceships to fly to Mars but it might be that it doesn't allow us to do faster than light travel to reach Alpha Centauri.
Not sure I answered your question satisfactorily if not let me know and I will try again. It's worth spending time on.