[Mezzie]

Yeah, my morphology teacher was a structuralist, and this was quite a while ago, so I have no doubt I'm biased there. (I actually preferred the cognitive stuff I was introduced to; I really liked working with metaphor in their systems and syntax/phonology/morphology were less my thing than semantics and sociolinguistics.)

You're definitely right that the definitions aren't cut-and-dried and that makes typology rather difficult.