You might argue that the Born rule is an extra postulate dictating how experience binds to the physical universe, particularly if you believe in a no-collapse version of quantum mechanics, such as many-worlds.
Yes, if you use a no-collapse interpretation, you will need to specify what sort of structure we are within the universe. However, this is a fact about us.
If you use a collapse interpretation, then of course you will also need a postulate for it, for reasons which should be utterly obvious.
You might argue that the Born rule is an extra postulate dictating how experience binds to the physical universe, particularly if you believe in a no-collapse version of quantum mechanics, such as many-worlds.
Yes, if you use a no-collapse interpretation, you will need to specify what sort of structure we are within the universe. However, this is a fact about us.
If you use a collapse interpretation, then of course you will also need a postulate for it, for reasons which should be utterly obvious.