I guess I understand what you're saying, but I'm not sure I agree with it. Obviously you're entitled to your opinion, and I find it an interesting perspective nonetheless.
I like Bjørn. I find him compelling because he reminds me of a lot of people I've met in my own life. His struggles with responsibility and desire, I think are rather relatable to, at least where I'm from, the general culture surrounding ones dreams and aspirations.
I disagree that they don't have any chemistry. Bjørn is a creative individual, a dreamer, an artist just like Arvo, but his creativity is being stiffled by his depression, his fear of failure, and of course his feelings of responsibility and obligation to his parents and to their future. He believes, in some respect, that he must earn the life that they gave him a chance at by achieving something great. He's drowning in the never-ending problem he's trying to face because he's not cut out for the field he believes would make his parents happy. Bashing his head against a brick wall, expecting it to break instead of finding another path out.
Arvo is also a dreamer and an artist. He desires to capture the beauty in the world around him, and because of his different upbringing from that of the bear, he holds the belief that he can achieve his dreams, but is stiffled by his fears of not being good enough. Stifled by his fears of messing up. Stifled by his fears of mediocrity. We see examples of this in a lot of different routes, but in this route we see a specific example in his conversation with Guðrun about photography where he admits to himself that he's lost the meaning of photography that he was originally striving for.
I think when Arvo looks at Bjørn, in some respect, he sees himself. In addition to that, Bjørn, just like Arvo, is extremely lonely. The whole route is focused on the idea of inhibitions, what they are, what they mean, and finding a balance between responsibility to others and to yourself.
So... Yeah... Sorry for the essay.