> Why can't I get Swedish subtitles in the US, for titles Neflix has the subtitles? I know this is to simplify the UI

Not true. I'm pretty sure it's licensing cost. In Germany most movies have subtitles only in German, while a handful also in English -- all Netflix originals and maybe some others. Meanwhile, basically all series have English subtitles for some arcane reason.

For me Netflix is a series-only service, I've given up on finding any movie worth watching that would have English subtitles.