Is Swedish more conservative than Danish and Norwegians?
I have read somewhere that Swedish is more conservative than the other continental North Germanic languages, Norwegian and Danish. Clearly Icelandic is more conservative then these all. But is the claim concerning the continental languages correct and why is it so?
I could imagine listing a bunch of features of each language. Nynorsk (and to lesser extent Bokmål) has three genders, Swedish has common gender nouns with varying vocal in plurals (-or, -ar and -er) while the others are less varied, Norwegian has genitive forms like «katten min», etc.
However, such an ad hoc listing seems a poor way of coming to a conclusion. A more rigorous standard for establishing how conservative these languages are would be helpful.