Define "worth it." I think Mullvad is a tad expensive but for protection while surfing the web it's a good service. And the fact that they take mail-in cash is unique.
You can just look for a pre-paid credit card wherever you are. You may have to sacrifice your name and number but you don't have to wrestle with the post office.
Stop generalizing the US and the West. Is Japan all the same everywhere? I'm gonna say no. Why should an even bigger country be then? Or another somewhat nebulously defined area that's bigger still?
What the average Japanese person would think a rowdy crowd is the average American's idea of enjoying a communal experience. One man's freedom fighter is another man's terrorist.
If you go see a kids movie you'll have some parents on their phones as well. The bad behavior is creeping in in Japan too. Plus, a lot of the movies arrive half a year or so later than a lot of other countries. And it's more expensive in my experience. Just for some perspective.
I suspect you look at the term "the West" and you think you're not part of that. You're "the East" if anything. If a jihadist screams "death to the West" they include Japan in there. You are a democracy, a developed nation, and you rely on the US for security, and you are not practicing Muslims either. A person in Central Europe could look at "the West" and might include Finland and Sweden in there but maybe not Ukraine or Bulgaria. And what do we do about Russia? West of Japan, east of Europe. Very big and shouldn't be generalized either. "The West" is an empty vessel people fill with lazy assumptions.