Earlier quoted context omitted.
Finnish is not so different dispute having different lineages. Even if we talk about morphology, sometimes it's simply that e.g. prepositions are affixed to the end of a word big whoop. There are many dimensions to language vairation. Finnish has a long history of contact with Scandi languages and a lot of borrowed words and logic. It would be good to have Estonian and possibly Baltic languages too. ETA: It is differ…
As someone growing up in relatively close contact with Finnish, I can assure you that there's no real common ground between Scandinavian languages (Swedish, Danish, Norwegian) and Finnish. There are loan words, but they are few and far between and in any case does not make for any mutual understanding. I've been so much to Finland that I would really like to learn to at least understand the language, instead of relyi…
It basically sounds like the language a Finnish person that has lived their whole life in Norway, and then starts to mix words because they forgot the Finnish words.
But that's about it. I know there are some other dialects, too, but these are all very small-scale languages that are either extinct, or will be extinct in some decades.
Much easier for Finns to learn Swedish, that for Swedes to learn Finnish, IMO. I speak Norwegian and Finnish (lived in Finland when I was young)