I think a lot of what you're describing is just a matter of how relevant technological advances are to the pieces of media in question, which isn't necessarily something inherent to the medium. Early 2000's CGI looks dated because it was the best they could do at the time and now we can do better. Early film/tv sounds dated because it was the best recording technology they had at the time and now we can do better. Most N64 games look more dated than most SNES ones because the technology of the SNES was able to tap into most of what the 2D sprite art style had to offer, while the N64 was barely scratching the surface of what could be done with 3D graphics.
Beyond that, there's the question of whether or not whichever pop culture norms a given piece of media demonstrates ended up sticking around. Sometimes, that's because that particular piece pioneered a new norm (Citizen Kane being the Citizen Kane of that phenomenon), other times it's just a coincidence that something that imitated the pioneer picked the right thing to imitate (like dual stick FPS games mimicking Halo's control scheme). This is generally quite noticeable in music, where certain songs will sound very much like products of their time, but others will fit right in with more modern stuff. Music has also been around for the entirety of human history, so it's to be expected that whatever evolution has happened within the last few decades is pretty small compared to what's happened in media where those few decades represent their entire existence.
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