My point is that the phrase “must pretend that we choose” is meaningless if we have no ability to choose, I.e. you have no choice whether to pretend you can choose or not, you either do or you don’t and it doesn’t matter how much you “must” do it.
Maybe what you mean is that we do pretend we can choose because that’s how we’ve evolved?
> you either do or you don’t and it doesn’t matter how much you “must” do it.
It does matter though. We're (massively complex) finite state machines of a sort. Given 'x' input, 'y' output is predictable (at least within reasonable statistical boundaries). The feeling that we're choosing is based on an illusion, but inputs can still influence outputs.
In this situation I get to provide your state machine with specific inputs and I can attempt to manipulate the output by changing my inputs. For example, by saying we "must" rather than saying we "should" my goal was make the likelihood of the outcome I wanted higher.
> Maybe what you mean is that we do pretend we can choose because that’s how we’ve evolved?
That's close to what I mean.
Consider the trained dog. If we tell him to "speak" he will bark. The bark is devoid of semantic content and isn't REALLY speech, but that word is the one I must use to get that output. Similarly, when you're told to choose to do something it can influence the actions you take. That doesn't mean that "you" made a "choice", it just means that the concept of choice is an input that can cause the state machine to oscillate longer and maybe work a bit harder before spitting out that deterministic output I mentioned earlier. The choice is an illusion, but it's an advantageous illusion.
When I said that we “must pretend that we choose”, what I really mean is that despite free will being an illusion it is still maladaptive to stop striving for beneficial outcomes or to stop holding yourself responsible for your actions.