Topic: Smoothness of "8px Small 0" @ 720p equal to "12px Average 2" @ 1080p?

I mean, 720p is 50% smaller vertically than 1080p just like 8px is 50% smaller vertically than 12px, so if 12px is considered "default" for 1080p then shouldn't 8px be considered "default" for 720p?