dvandvas and appositional compounds show a complementary distribution in a language L.
5) Dvandva Appositional (natural coordination) (accidental coordination) SAE x o Asian languages o x
2010: 192) state that the generalization (4) "is to be understood as a trend, rather than as an absolute universal", pointing out that Russian dialects having dvandvas often allow appositional compounds borrowed from standard Russian to appear.
I move on to the question of whether Japanese really lacks appositional compounds.
This means that English strictly obeys Arcodia's (2010) generalization in (4) in that dvandvas and appositional compounds do not coexist in the same language.