*shrug* Let people wear what they want and don't let it bother you.
It would be nice if people could find ways to work their steampunk fetishes into animation/comics ~ but it shouldn't be a requirement.
Hayao Miyazaki and Renge Murata are both hard up for steampunk. They'd both probably get a kick out of it.
I find original steampunk costumes no more disconnected from the topic at hand than original maids, catgirls and assorted misinterpreted Japanese stereotype costumes ^^; Anime and manga do not = Japan. To assume they do is kind of naeive. And honestly, quite a lot of steampunk costuming is more visually interesting and in the spirit of the sort of imagination we expect from the medium of animation than Death Note closet cosplay.
I don't really see the connection between Jpop and anime either... but everyone's crazy about those washed-up-Visual-Kei-band concerts
You don't have to get it for other people to enjoy it.
And really... is MORE available programming and variety ever
an issue to complain about?