it never changed, p in 1080p always referred to progressive lines as it came from movies/tv, 4k always meant 4096 at horizontal. We still have 2160p which is 38

it never changed, p in 1080p always referred to progressive lines as it came from movies/tv, 4k always meant 4096 at horizontal. We still have 2160p which is 3840×2160 They never replaced each other, just different definitions for screen sizes