Let me rephrase that.
"Hello everyone, ztrot here, destroying your dreams since 2008!"
seriously (i'm sorry for that rather rough introduction btw

), after working for months on my first map, getting mods, starting to mod other maps recently and shoot my kudosu at my own map, i'll have to completely change it

i mean i don't even have to change as much as many other mappers. some will have to delete complete difficulties.
"This new rule might seem scary at first but, fear not as we don't want to forget our professional osu! players either!"
yeah, seemingly you don't want to forget the professional osu! players, so let's just forget the mappers instead
Also there's just times when not all difficulties fit to the map. Times when you have something different in mind in terms of the spread.
This will not only significantly increase the work of mappers, moders, BN's and QAT's, it will also erase a part of the mappers freedom. In my opinion we need more freedom instead of more restrictions!