Fair point; that's partly my own bias (I know basically nothing about non-Western musics), and partly because of the article I'm responding to ("Bach doesn't tell us anything about gamelan music" isn't an interesting observation).

But also: the majority of academic music theory at the moment does focus broadly on the Western tradition. That's changing, I think, but a quick scan of recent articles in Music Theory Online (https://www.mtosmt.org/issues/issues.php) reveals quite a broad spectrum of music, most (not all!) of it is from the Western tradition.