Natively understanding another language gives you access to a whole different information sphere. With different taboos and focuses. So topics completely undiscussable or unpolite in one language, is perfectly analyzed in another language. I've noticed the level of censorship significantly increasing on dominant English platforms (Say youtube), which is harder to see, if you can only speak English.

This makes it very easy to identify cultural shibboleths, disinfo or even just low-relevance/importance information.

However, this only works if you truly have native language levels in two languages. If you find it 'painful'/'difficult' to read the second language in any way, you'll avoid it outside of work, and therefore forfeit the advantage. This is also why even the inconvenience of translation will destroy this advantage.

Also, this requires the second language to be sufficiently distant from the first, while still being a large-population language.

So knowing Danish/Irish perfectly doesn't give you access to a whole different worldview.

This criteria is harsh, and for more entertainment/cultural value, LLM translation is basically good enough even for novels, there's no point in learning a foreign language at a low level anymore.