It may be practical in that there might not be any better option, but it would be dangerous to believe that you are gaining actual insight into the subjective e

It may be practical in that there might not be any better option, but it would be dangerous to believe that you are gaining actual insight into the subjective experience of the other person (whom, technically we don't even know exists as a separate entity). At best, you can perhaps know that you are gaining insight into your own model of another person.