Are communicability and verifiability the only reasons to prohibit other true results?
First you need to remember that science is not the only form of research. Second, subjective results come in all sorts of flavors. If I ask one person person if they like A better than B, that is a subjective result. If I ask 1000 people, and do statistics, is that still a successful subjective result? Someone else could ask a new group of subjects the same question and verify my results.

Now consider an objective measure of a one time event (e.g., the amount of snow that fell during a storm). No one can verify the measurement, but it is still objective.