I recon this as a good idea. Obviously ranking routine will be greatly simplified because nominator team never need to judge the gap between Extra to OMFGITSSKYSTAR when they are in doubt or incapable to play the difficulty. Plus mappers will have to decide which difficulty to keep, a better GD or a just-so own made diff. This will greatly increase the overall quality of qualified maps. If players want to play other mappers' difficulties, they could choose to play unrank maps, like what currently Taiko mode players do.
In other aspect, people must stay clear that it is unfair to stick their difficulties to anither mapset just because the songs name the same. It is their obligations to seek mods and ask for qualifications with their own efforts.
Everyone does know that it is unlikely to retract a newly addressed rule like slapping oneself. Thus, why shan't we enjoy it and push forward?
In other aspect, people must stay clear that it is unfair to stick their difficulties to anither mapset just because the songs name the same. It is their obligations to seek mods and ask for qualifications with their own efforts.
Everyone does know that it is unlikely to retract a newly addressed rule like slapping oneself. Thus, why shan't we enjoy it and push forward?