Not everyone believes that everything is commesurable and people often wish to be able to talk about these issues without implicitly presuming that fact.
Moreover, values suggests something that is desirable because it is a moral good. A priority can be something I just happen to selfishly want. For instance, I might hold diminishing suffering as a value yet my highest current priority might be torturing someone to death because they killed a loved one of mine (having that priority is a moral failing on my part but doesn’t make it impossible).
Not everyone believes that everything is commesurable and people often wish to be able to talk about these issues without implicitly presuming that fact.
Moreover, values suggests something that is desirable because it is a moral good. A priority can be something I just happen to selfishly want. For instance, I might hold diminishing suffering as a value yet my highest current priority might be torturing someone to death because they killed a loved one of mine (having that priority is a moral failing on my part but doesn’t make it impossible).