Let's be honest, TV shows and movies nowadays are dogshit storywise. Video games have way better stories because they actually have to engage the audience to want to discover it. TV shows just need to grab attention for a season, get cancelled and move on to the next season long trailer.
Mass Effect made a game with a Sci-Fi story better than any Sci-Fi show that has come out since then. WarHammer 40k did a pretty good job too.
It's nowhere near "good music doesn't exist anymore". They are the same old plotlines with that double crescendo bullshit. The only thing that really changes are the characters and setting. Sometimes they add a twist here and there in order not to be too obvious, but if you watch enough stuff, they feel the same.
Trailers have genres themselves. You can watch a trailer and know nearly the entire plot of a movie plus what the genre is. The colors also give away so much about that: blue - technology, dark tones - horror, greenish blue - techy sci-fi, colorful - probably art-house, etc. there are entire pallets dedicated to genres and their subgenres.
The way the cameras move, the chosen audio effects, scenes that unnecessarily capture a specific object or center an unknown thing, a few frames of a look, and so much more.
Writers and the creative personnel have been hamstrung by the focus on ROI. Remakes and sequels are the biggest investment these days. There's very often some attempt to build a franchise or continue one.
Music has changed massively. Outside of mass media, you can't take a song from now and say "wow, this sounds like something from the 80s". The red hot chili peppers, black sabbath, metallica, and other bands used to be considered metal, but that's unrecognizable as metal nowadays. Maybe rock?
Music has mashed together so many genres that you can go and type nearly any genre in a search engine to find music of it.
You're just objectively wrong. You're making sweeping generalizations about entire industries and you're just wrong. It's exactly the same as the music thing, you're just refusing to accept it.
There's a lot of trash. Maybe it's mostly trash even. But there's also the best stuff that's ever been on TV. It depends where you're looking.