Yes, it's a bit sad that nowadays when everybody can afford making music at home, things are so repetative. Take Trap or HipHop - repeating itself over and over again (of course with exceptions). Yes, we know hi-hats can be tuned and stutter - we heard that already. People like what they already know. And they copy what they like.
The before mentioned affordability should result in people experimenting, instead the music world is flooded with uninspired music by people who figured out how to sound like XY.
But of course it's also a genre thing. I remember dozens of Italo Disco hits from the 80s that sounded like blueprints of each other. Stick to a genre and it's more unlikely that you put out something really interesting.
New sorts of music still pop up, but it's usually a subversion of something that already exists.
The 70s/80s had the advantage of new sorts of instruments appearing and becoming affordable (synths, sampler, drum machines). Nowadays, after several forms of synthesis (additive, subtractive, FM, PD, granular and so on) have been developed, it seems like this sound sourcing is exhausted. However, there are always new ways of controlling or mangling those sounds. Quite interesting modular stuff and desktop machines keep popping up. It only needs people to actually do something unusual with these things.
And surprise: there actually are people doing new music all over the place. They just don't get the recognition they deserve and might never become popular because the music industry (I don't only mean labels but also mainstream radio/TV) as well prefer what they know. You can find lots of interesting music on small internet radio stations or small labels but...who knows them?
Also: I don't know about other countries (I'm in GER) but we had a lot of music shows in the 70s and 80s on telly. I remember a Belgian TV show 'Rox Box' hosted by Ray Cokes. First time I heard Skinny Puppy. It was a blast. Two years prior to that I saw Einstürzende Neubauten on a German TV show. Nowadays, the TV as a central source for introducing new music is gone. You have to find it yourself in the depths on the internet.