Yea I've considered about this and I don't think there's any serious gap between normal and hard.
Secretpipe wrote:What about the gap between normal diff and hard diff ? oAo
Just have a look at this ranked map: https://osu.ppy.sh/s/198820
This map also use just white line rhythms in normal diff, while many red line rhythms in hard diff (1.08 stars of gap?). And also there's a huge gap between Insane and Lumiere. So in my opinion, using white line only doesn't equal to simple and easy, especially for new players.