?et (and therefore more vulnerable to freezing or stunning)
I think the OP's question is: how do you know that Wet makes someone more vulnerable to freezing or stunning? Also, what does "more vulnerable" mean, anyway?
The manual has little-to-no information on what the various status effects do.
characters get a status effect then you can mouseover the status and get information about what the status does. That same mouseover does not apply to status effects on enemies. It should.
(As far as the example above goes, I do know that if you Chill a Wet target then it becomes Frozen. I don't know if Wet has any effect on cold damage, however).