@FAT4LS the reason they do that is so that you can read the chapters a bit faster. It takes much longer to translate an entire 50~ something page chapter than it does to translate a 10 page quarter chapter. Be grateful that anyone is translating this at all because you get to read it for free.
@dkdumpling Quarter releases are useless to me as I tend to wait for the whole chapter to be released before I read it, anyway. Otherwise I have to go back and constantly reread the other parts of the chapter every time a new part is released.