Is "Crouching Tiger, Hidden Dragon" not a valid film for me to enjoy because I can't appreciate it in its native Mandarin? That sounds even more pompous to me.
Some (e.g. Vienna) have a seat-back system that shows subtitles.
Surtitles, on the other hand, are pretty much ubiquitous.
You're correct to compare them to Musicals though, in terms of content/storyline they are very similar, the musical style and social class of the audience (in general) are the big differentiator. You can also listen to Opera without visiting an Opera house though.
Opera is a remnant of the worst kind of nouveau riche status seeking.
This is a bit reductive and unfair - people can enjoy the music of Opera without thinking it makes them better than others.
If you go to see a live opera, there are often subtitles above the stage. If you watch them on video, there are subtitles.
But... There is something to be said for listening to an Opera in a language you don't speak. It completely bypasses any part of your brain that tries to intellectualize, and just hits you in the feels.
It's not always about status seeking, it's about getting away from the ugliness that pervades the world around you and getting lost in something beautiful in it's own right.
I don't often enjoy 'watching' Operas, the visual context keeps me locked in the state of mind I'm trying to escape from. Only listening. Rare exception to the special treat of a singer belting out in a random spot on the streets.
Just wanted to point out that not everyone looks at art as a social ladder, or even take the same things out of art that someone else does.
And for Wagner in another non-German speaking country: https://www.operasofia.bg/en/component/k2/item/download/512_... (Wagner in an actual cave was quite fun)
Why do Americans listen to Opera in languages they don't speak? The English watch English operas, the French French, Italian Italian, etc. This is because the newly wealthy 19th century Americans wanted to seem fancy like they thought the rich Europeans were.
The less pretentious form is just musicals, which are as popular today as they've ever been.