Oh!!! I've thought about this one a lot actually!! I think he would be able to relate to them a lot in a way. Even if their homes are isolated, roku holds that lifestyle in high esteem. It is not easy to live secluded in from the world and maintain your own village at the same time, even if in relative peace. So I think he'd respect that a lot about the woods viera, but would probably share a common understanding of those who left the woods to seek the world outside of what they knew, just as he did. The cultural isolation doesnt have to be bad though, I think what made him not like it is how any contact with the outside world in his village could possibly result in an exile, and even helping those outside was too much. Which is why he left, but the sui no sato opening themselves up to trade ofc is a great step to...not necessarily changing their ways, but rather adapting with the times. I dont think he'd know a lot about how woods viera see the world(he doesnt know any viera outside of msq, actually...) and probably thinks its not his place to judge due to lack of knowledge, but if it was anything like his village than yeah, there would be some commonground between him and them.