Come to think of it, do you think Sony's apparent new policy of disregarding Japan is tied to some of their other activities of recent years? You know, like how Sony has generally released less smaller games since the PS3 era ended, how Japan studio was effectively closed down, the fact that Sony's acquired been acquiring Western dtudios like Insomniac and Bluepoint, how their censorship policies have been adjusted since 2016 or so, etc.
I'd argue that the PS4 didn't benefit THAT much from Japanese games, but looking back, I don't think so. We don't have as much data as we did a few years ago, but games like Final Fantasy XV, Final Fantasy 7 Remake, Kingdom Hearts 3, Monster Hunter World, Resident Evil 7, Gran Turismo Sport, and Street Fighter V are all likely 5+ million sellers on PS4 alone.
Can anyone think of anything like this happening before, where a major player in hardware simply abandoned one of their best markets? The closest I can think of is Sega F8ing themselves over in the mid-90'sa with their massive divide between their Japanese and American divisions, but that's not really the same thing.