It could be the Tokyo Olympics coming up next summer. The big media love to do expose's showing the dark/seedy side of the host countries culture to boost their ratings. It looks quite possible the govt. has asked JAV producers to tame their content so the big media has less embarrassing content(especially really young women) to expose. It does look like most releases are much tamer than a few years ago, so many of the same actresses, mostly creampies, tame loli, bland productions, etc. I certainly could be wrong but I guess we'll find out after the Olympics finish Aug, 2020.