Changing scenes/songs was nothing unusual for Western versions of anime in the past. I can’t tell how it is today, since when internet & fan subs became more popular I started watching mostly fan subs but before when anime were broadcasted by TV stations in synced version you often get either a complete different song or a somewhat “series” song in your own language but not in any case with the same rhythm & melody.
We also only get a % version of Red Cliff since they kept the battle scenes but cut most of the story scenes so that’s not really something new with the cutting/changing of scenes for Western audience.
Your example with Game of Thrones and Stranger Things doesn’t fit since it’s USA => Europe = all Western areas. Better think about it in the way, e.g. World of Warcraft has its own Chinese version with undeads without visible bones etc.
They may also change things from Western movies/TV shows, we probably just don’t know it since it doesn’t affect us.
Depending on the content e.g. violence, we’d also have altered versions of Western/US movies/shows & games in Germany. Many old/er “cult” movies used to be only shown as “cut/edited” version on TV.