The Copenhagen promo that "observer choice" affects quantum outcomes or manifestations doesn't seem to cut the mustard simply for logical reasons. Here's why.
There is no choice asymmetry for quantum outcomes to be dependent on. This is because a choice and no choice reduces to different ways of acting on two possibilities (even assuming that there is a physical or quantum link between choice and quantum events).
So if it isn't "choice" that the Copenhagenists declare to be critical in quantum outcomes then is it "observing"? ...
....how hard must we "observe" for a quantum outcome to become manifest (their term is "collapse")? Very hard - only in scientific labs?
If I give something barely a second look, would that lead to quantum collapse?
How do we know when we are observing and not daydreaming or staring hard? Do quantum collapses show us?
But then how do we know what "observing" is? Do quantum collapses inform us of that too?