Why the heck would you want to make easier something thats supposed to be hard? If you make something hard easy its not hard anymore and that makes no sense at all. Its the best the way it is.Youre not mapping a song to make it difficult. You map a song because you probably like the music and would like to create something that you can share with other players. If a song is calm/slow at a section, then that section is not meant to be fucking hard. If it was, then the artist wouldnt have made it calm. Easy as that.
If it's a fast song, then it's its nature to be difficult on the highest difficulty.
Relevant for that