[happytoexplain]

>is individuality in art and media now seen as a negative

Perhaps by successful corporations in contexts where "doing what works" is the safer bet (like you said, Disney). But of course it's not seen that way by individuals.

Overall I think you're just perceiving popular culture, not artistic mediums in general. E.g. for your point about EDM, maybe you're thinking of the music you hear in clubs or web radio, but the blanket indictment of EDM you've put forward is not correct I think.