I wonder if we should let this become the next topic because right now I can see this thread being derailed into a discussion about ranked charts and I'm at the heart of it
frankly I don't think language should be considered, but musical genre: in the June charts there were 11 10 English songs, which would have been fine had there been more variety in the genre (there was like one punk song, 2 rock songs, and a bunch of synthpop/poprock/wussrock) and while japanese music does have its own palette of flavours, the vast majority of japanese music mapped is pop, so there's where the complaint is coming from, I think.