Can't these two coincide? As you mention, joy is subjective. For you, joy can be utility, and for someone else that can be something else. I think it's reasona

Can't these two coincide? As you mention, joy is subjective. For you, joy can be utility, and for someone else that can be something else. I think it's reasonable to suggest the rule for what things you should keep should be based around what you find good. If you mean utility in the John Stuart Mill way, then joy is the same thing but probably easier for the average person to grasp immediately.