The point is that people can erroneously report, even to themselves, that they believe their experience could only be caused by cause A. Asking the question if you would still anticipate the experience if cause A did not exist is a way of checking that you really believe that your experience could only be caused by cause A.
More generally, it is useful to examine beliefs you have expressed in high level language, to see if you still believe them after digging deeper into what that high level language means.
The point is that people can erroneously report, even to themselves, that they believe their experience could only be caused by cause A. Asking the question if you would still anticipate the experience if cause A did not exist is a way of checking that you really believe that your experience could only be caused by cause A.
More generally, it is useful to examine beliefs you have expressed in high level language, to see if you still believe them after digging deeper into what that high level language means.