> So any complex dialogue or nuance is off the table.
What a bad take! Do you seriously think complex thoughts can only be expressed in English and cannot be translated?
1. English is an unusually compact language. If you watch dubbed movies you will notice that the characters often have to talk extremely fast compared to the original and much dialogue is rephrased to be simpler. They can't refilm the sequences so in languages that take more words, the dialogue must be simplified.
2. A lot of people won't get dubbed versions anyway, so they'll be watching it as a foreign language.
Nonetheless, you seem to be fluent. Lots of people around the world speak some English but aren't fluent, don't get dubbing or subtitles into their own language for every film (or do but way late and they don't want to wait), and some of those people could in fact struggle to follow complex dialogue or might misunderstand idioms.
Or that the dubbing was horribly inaccurate ?
Of course not. We came to see amazing fight scenes.
Likewise, with Marvel movies the plot is barely serviceable non-sense. We came for Sci Fi special effects, jokes and fan service.